Synopsis of BATCH control language ( 2008.07.31 )
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 
$SETUP
   {DEFAULTS [YES or NO]}
   SOLUTION    [COMPLETE or FORWARD or BACK or GLOBAL_ONLY or INDEPENDENT or
                SUPPRESS{ION} or *SUBTRACT]
   CGM         [NONE or input_name] {output_name}
   {MERGE_CGM  [NONE or (input_file )... ]
      .
      .
      .                              }
   ARC_FILES  {SAVE} [NONE or 0 or [dir_1 [0 or dir_2 [0 or dir_3]]]
   ID          [60 characters]
   {TRAIN [YES or NO GLO_PARLIM <number> INC_PARLIM <number>]}
   {SORT  {NO  or  {YES}  STATIONS [NO or ALPHABET or LONGITUDE]
                          SOURCES  [NO or ALPHABET or RIGHT_ASCENSION] } }
   {USER_PROGRAM [NONE or NAME {USER_BUFFER $STRING$}] }
   {USER_PARTIALS    [NONE or PROGRAM_NAME] }
   {USER_CONSTRAINTS     [NONE or PROGRAM_NAME] }
   {WEIGHTS  [NO or IN or (  [USE or REQUIRE or MAKE or APPEND]
                           [weight_file or (#NUM weight_file ...) ]
                           { [BY_SITE or BY_BASELINE or BY_ARC or DEFAULT] }
                           { ALGORITHM [MYWAY or UPWEI or UPWEI_OPT or
                             (ELIM paru_file)]     } ) ] }
   {SOURCE_WEIGHTS [NO or ( [USE or REQUIRE] source_weight_file] ) }
   {ELEVATION_DEPENDENT_NOISE [NO or [YES el_dep_noise_file] or
                                     ([GLOBAL global_sigma]
                                      {[STATION_FILE file_name]})]
   {USER_TAG  [user_inits] SOL_TAG   [solution_tag]}
   {FAST_MODE [NONE or B3D or B1B3D]}
   {FAST_DBG  [NONE or APPEARANCE  or PRINTOUT or TIMER or MONITOR]}
   {FAST_COV  [GLOBAL or LOCAL or SEGMENTED or FULL]}
   {SAVING_RATE  <rate>}
   {EMULATION [0 or 9612]}
   {SUPMET       [UND or PRE98 or PRE91 or COMB1 or SNGBA]}
   {QUALCODE_LIMIT [1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9]}
   SINGULARITY_CHECK [NONE or ACTION [NONE or WARINING or REPARAMETERIZE or
                                      SKIP or STOP]
                              SOUMIN [NO or <non-negative_integer>]
                              STAMIN [NO or <non-negative_integer>]
                              BASMIN [NO or <non-negative_integer>]]
   {DECIMATION [NO or
                      [CREATE  directory [ASCII or BINARY]] or
                      [REQUIRE directory param] or
                      [USE     directory param]
               ]
    APRIORI_OBS_CORR {NONE or ([USE or REQUIRE} aoc_file_name)]
   {WARNING [NO or ON or OFF]}
$FLAGS
   SOURCES         [NO or YES or IN] {REF_EPOCH epoch} {src_comp}
                   [ref_source or PICK or
                    EXCEPT ([src_comp] source ...\) }
   {PROPER_MOTIONS [NO or YES] {src_comp} {EXCEPT ([src_comp] source ...\) }
 
   STATIONS    [NO or YES] {REF_EPOCH epoch} {sta_comp} {D}
               [ref_station or PICK or
               {EXCEPT ([sta_comp] station) ...\) ...}]
   VELOCITIES  [YES or NO] {sta_comp}
               {EXCEPT ([sta_comp] station) ...\) }
   {HARMONIC_POS
    [NONE  or
     @file_name or
               (NAME (name_of_harmonic)
                STATION   [@file_name  or (station ...)]
                PHASE     (value_in_rad)
                FREQUENCY (value_in_rad/s)
                NNT_CNS_SIGMA  (sigma_of_constraint) \
                NNR_CNS_SIGMA  (sigma_of_constraint)  \
               ) ...
              )
 
    ] ...
   }
  {SPLINE_POS
    [ NONE or
      @file_name or
      STATION (station_name)
      DEGREE  (degree_value)
      [ NODE    (epoch)  MULT (multiplicity) ]...
      CNS_STA_SIGMA                 (sigma_of_constraint)
      CNS_VEL_SIGMA                 (sigma_of_constraint)
      CNS_DER_SIGMA    (derivative) (sigma_of_constraint)
    ] ...
  }
   ATMOSPHERES [NO or IN or FORCE or
               [(MOST interval_in_minutes) or
                (AUTO interval_in_minutes {EXCEPT NO {station} ...\})] ]
   CLOCKS      {MAX_DEGREE [IN or ([AUTO or MOST] [1 or 2])]}
                INTERVALS  [IN or or NO or
                          ([FORCE or AUTO or MOST] interval_in_minutes)]
 
  *CLOCKS                    [DEFAULT or
          ([FORCE or AUTO or PICK or MOST] interval_in_minutes)]
   UT1/PM      NO or
           [(POLYNOMIAL {OFFSET xyu_comp} {RATE xyu_comp} {2ND_ORDER xyu_comp}
                        {START or END or MIDNIGHT or NOON or MIDDLE or
                         DAYOFTIME_EPOCH time or EPOCH date }) or
            (SEGMENTS_G.RATE {INTERVAL int_in_min
               PM_RATE_CONSTRAINT constraint_pm
               UT_RATE_CONSTRAINT constraint_ut} }  ) or
            (SEGMENTS_ONLY {INTERVAL wob_comp
               PM_RATE_CONSTRAINT constraint_pm
               UT_RATE_CONSTRAINT constraint_ut
               {EOP_FILE NONE or RESET or APPEND} } ) or
            (SINE_STYLE  PM_RATE_CONSTRAINT constraint_pm
               UT_RATE_CONSTRAINT constraint_ut) ]
 
   *UT1/PM      [YES or NO or
                    (WOBBLE [({OFFSET wob_comp {RATE wob_comp}}) or (eop_type
                {int_in_hrs constraint})] UT1 [({OFFSET ut1_comp
                    {RATE ut1_comp}}) or (eop_type {int_in_hrs constraint})]
                {OFF or APPEND or RESET})] {MIDDLE}
   NUTATION        [NO or OFFSET or XY_OFFSET ]
   PRECESSION      [NO or YES]
  {ERM
    [ NONE or
      DEGREE    E1  degree
      DEGREE    E2  degree
      DEGREE    E3  degree
      SPAN_DAYS E1  time_interval
      SPAN_DAYS E2  time_interval
      SPAN_DAYS E3  time_interval
      DATE_BEG  start_date
      DATE_END  end_date
      CNS_DER_SIGMA  E1  order  sigma
      CNS_DER_SIGMA  E2  order  sigma
      CNS_DER_SIGMA  E3  order  sigma
    ]
  }
  {HEO
    [ NONE or
      ( YES REF_EPOCH reference_epoch \
        (
          W name phase frequency  acceleration
                 e12_est_flag     e3_est_flag
                 e12_cns_flag     e3_cns_flag
                 e12_vel_est_flag e3_vel_est_flag
                 e12_vel_cns_flag e3_vel_cns_flag \ ...
        )
        (
          C name_1 real_ampl_1 image_ampl_1  name_2 real_ampl_2 image_ampl_2
        )
        (
          CNS constraint_name SIGMA sigma_value )
        )
      )
    ]
  }
   {GRADIENTS      [(YES <interval_in_hours> {EXCEPT NO station ...\}) or
                    (NO {EXCEPT YES <interval_in_hours> station ...\})]}
   {HI_FREQ_EOP    [NO or (YES  file_name)]}
   RELATIVITY      [NO or YES]
   {AXIS           [NO or YES] {EXCEPT (station ...\)}}
   BASELINE_CLOCKS [NO or YES or IN]
   STRUCTURE_ADMITTANCE [NO or
                            ([GLOBL or LOCAL]
                             [YES or ALL or NO]
                             {EXCEPT source1 source2 ...})
                        ]
$OUTPUT
   RESET        [YES or NO]
   FORWARD      [YES or NO or LAST or number_of_sessions]
   BASELINES    [YES or NO]
   MINIMUM      [YES or NO]
   *SCREEN      [YES or NO]
   *COVARIANCES [NO or
                       (YES [ALL or BY_SESSION or CGM or (dbname ver)]
                            [STA or NUT or EOP or ALL or SOU])]
   {CORRELATIONS [NO or YES FORMAT [ASCII or BINARI]
                    [{ GLO_GLO   PARAM_INCLUDE <par_filename>
                                {PARAM_EXCLUDE <par_filename>} }
                     { GLO_LOC   PARAM_INCLUDE <par_filename>
                                {PARAM_EXCLUDE <par_filename>}}
                     { LOC_LOC   PARAM_INCLUDE <par_filename>
                                {PARAM_EXCLUDE <par_filename>}}
                     { CROSS_LOC PARAM_INCLUDE <par_filename>
                                {PARAM_EXCLUDE <par_filename>}}
                                 SES_INCLUDE   <ses_filename>
                                {SES_EXCLUDE   <ses_filename>}}
                    ]
                  ]
   {STATION_TABLE [NO or YES ]}
   {POS_ELLIPSES  [NO or YES]}
   {MOD_FILES     [YES or NO]}
   {RESIDUALS     [NONE or file_name]}
   {MINIMIZE_SIGMAS     [YES or NO]}
   {SINEX               [ NO or
                           [ YES
                             FORMAT_VERSION               value
                             ALLOW_OVERWRITE              [YES or NO]
                             GLOBAL                       [YES or NO]
	                     LOCAL                        [YES or NO]
                             SEGMENTED                    [YES or NO]
                             ESTIMATES                    [YES or NO]
                             COVARIANCES                  [YES or NO]
                             CONSTRAINTS                  [YES or NO]
                             DECOMPOSED_NORMAL_EQUATIONS  [YES or NO]
                             ACKNOWLEDGMENTS_FILE         <input_file_name>
                             COMMENTS_FILE                <input_file_name>
                             INCLUDE_PARAM                <input_file_name>
                             EXCLUDE_PARAM                <input_file_name>
                             OUTPUT_FILE                  value
                            ]
                         ]
   *{NORMAL_MATRIX      [NO or YES or ZERO]}
   {SEG_OUTPUT          [YES or NO]}
   *{MAPPED_EOP_OUTPUT  [YES <time_epoch> or NO]}
   *{APRIORI_ZENDEL     [NO or YES]}
   {CRES_EMULATION [199804 or 200308 or NO]}
   {LISTING_OPTIONS
        SRC_STAT  [PRE2004 or SHORT or LONG]
        SEG_STYLE [PRE2005 or POST2005 ]
   }
   {NRD_TABLE [YES or NO]}
   {CHI_SQUARE_TABLE [YES or NO]}
$CARRY
   STATIONS     [YES or NO] {sta_comp} {EXCEPT (station ...\)}
   SOURCES      [YES or NO] {EXCEPT (source ...\)}
   {AXIS        [YES or NO]}
$DATA
   SOURCES      [YES or NO] {EXCEPT (source ...\)}
   STATIONS     [YES or NO] {EXCEPT (station ...\)}
   *{BASELINES  [YES or NO] {EXCEPT (<station-station> ... \)}}
   TYPE      [GROUP_DELAYS_AND_RATES or GROUP_DELAYS_ONLY or
              PHASE_DELAYS_AND_RATES or PHASE_DELAYS_ONLY or
              GRPRAT or PHSRAT or SNBRAT or GRPONL or PHSONL or
              SNBONL or RATONL or  G_GXS or PX_GXS or PS_GXS or
               PX_GX or  PX_GS or  PS_GX or  PS_GS or  P_PXS or
                  GX or     GS or     PX or     PS]
   {ELEVATION cutoff {EXCEPT cutoff (station ...\) {cutoff (station...\) ...}}}
   {WVR_MASK [NO or mask {EXCEPT mask (station ...\) {mask (station...\) ...}}]}
   *{EVERY [NO or (<N>  START  <M>)]}
   NORATE_FLAG [NO or YES]
$CALIBRATIONS
  {ION     [ON or OFF or IN]}
  (KEEP    [NO or <calibration_name>]) ...
  (ENABLE  [NO or <calibration_name>]) ...
  (DISABLE [NO or <calibration_name>]) ...
  *DEFAULT
   *{[AVAILABLE or (AVAILABLE corfile_display_name ...\)]}
   *{(corfile_display_name [ON or OFF or IN]
                          {[ALL or NONE] {EXCEPT station ...\}}) ...}
   *{(GROUP corfile_display_name ...
            [(PICK DEFAULT) or
            ((PICK corfile_display_name ...)
              {{ELSE corfile_display_name ...} ...}
                {ELSE DEFAULT} )]
                {STATIONS {[ALL or NONE] {EXCEPT station ...\}}} \) ...}
   *{(USE corfile_display_name FOR corfile_display_name)        ...}
$PARTIALS
   {SET} <partial_name> {ON}
$CONTRIBUTIONS
  ({SET} [NO or NONE or IN or <contribution_name> ...] )
$MODE_CALIBRATIONS
  ({SET} [NO or NONE or IN or <mode_calibration_name> ...] ... )
$MAPPING
   STATIONS        [NONE or file_name]
   PLATE_MODEL     [NONE or ( [AM0-2 or NUVEL]
                              {REF_DATE <date>}
                             *{SCALE scaling_factor} *{FIX plate_name} ) ]
   VELOCITIES      [NONE or file_name] {REF_DATE <date>}
   SOURCES         [NONE or file_name]
   EARTH_ORIENTATION  [NONE or file_name] {[LIN or CUB or SPL]}
                     {[UT1R or UT1S or NO_ZONAL]}
   NUTATION_SERIES    [NONE or file_name]
   SPLINE_DISPLACEMENTS
     [NONE or
      (BSP (file_name))...
     ]
   *{EPISODIC_MOTION   [NONE or file_name]}
   {ECCENTRICITY      [NONE or file_name]}
   {HI_FREQ_EOP      [NONE or file_name]}
   {HARMONIC_EOP    [NONE or file_name]}
   {PRESSURE_LOADING [NONE or file_name]}
   {PIECE_WISE_STA   [NONE or file_name]}
   {AXIS_OFFSET      [NONE or file_name]}
   {SITPL            [file_name]}
   {METRIC_TENSOR [NONE or IERS92 or GRS or TOPOCNTR]}
   {POSITION_VARIATIONS  [NONE or
                        (external_file [HARMONIC_MODEL or TIME_SERIES]
                         [LINEAR or SPLINE] [REQUIRED or IF_AVAILABLE] ...) ]
   ERM  [NONE or erm_file]
   VTD_CONF [NONE or vtd_file]
   EXTERNAL_TRP_DELAY [NONE or {[REQUIRE OR USE] DIRECTORY {directory_name} ]}]
  ANTENNA_THERMAL      [NONE or (MODEL  model_use  model_file_name  INSITU
                                [NONE or insitu_file_name)]
$CONSTRAINTS
   {EARTH_ORIENTATION [ IN or NO or
                        ( YES {SIGMA x_s_mas y_s_mas u_s_ms} *{FACTOR sigfact}
                          *{RATES
                            [NO or { SIGMA x_s_mas/day y_s_mas/day u_s_ms/day}]}
                        ) ]
   *{NUTATION         [YES or NO] {SIGMA} {psi_mas eps_mas}}
   {ATMOSPHERES [IN or NO or
                (WEAKEST constraint_in_ps/hour) or
                *(MOST constraint_in_ps/hour) or
                (YES constraint_in_ps/hour
                {EXCEPT constraint_in_ps/hour station})]}
   {CLOCKS      [IN or NO or
                 (WEAKESTconstraint_in_parts_in_1.d-14)
                *(MOST constraint_in_parts_in_1.d-14)
                    or
                      (YES constraint_in_parts_in_1.d-14
                      {EXCEPT constraint_in_parts_in_1.d-14 station})]}
   *{GRADIENTS        [NO or (YES  <offset_const_mm>  <rate_const_mm/day>)]}
   {STATIONS   [NO
                   or
                      (XYZ [NO
                               or
                                  (NO  SIGMA <x_meter> <y_meters> <z_meter>
                                             {EXCEPT (station ...\)} )
                               or
                                  (YES SIGMA <x_meter> <y_meters> <z_meter>
                                             {EXCEPT (station ...\)} )
                           ] )
                      (UEN [NO
                                or
                                  (NO  SIGMA <u_meter> <e_meters> <n_meter>
                                             {EXCEPT (station ...\)} )
                                or
                                  (YES SIGMA <u_meter> <e_meters> <n_meter>
                                             {EXCEPT (station ...\)} )
                           ] )
               ] }
   {VELOCITIES [NO or
                      (XYZ [NO
                               or
                                  (NO SIGMA  <x_mm/year> <y_mm/year> <z_mm/year>
                                             {EXCEPT (station ...\)} )
                               or
                                  (YES SIGMA <x_mm/year> <y_mm/year> <z_mm/year>
                                             {EXCEPT (station ...\)} )
                           ] )
                      (UEN [NO
                               or
                                  (NO SIGMA  <u_mm/year> <e_mm/year> <n_mm/year>
                                             {EXCEPT (station ...\)} )
                               or
                                  (YES SIGMA <u_mm/year> <e_mm/year> <n_mm/year>
                                             {EXCEPT (station ...\)} )
                           ] )
                 ] }
   *{PIECE_WISE_STA  [NO or (YES <mm/yr>)]}
   *{NUVEL_COVAR      [YES or NO] fixed_plate {weight} {EXCEPT (station ...\)}}
   {SOURCES           [NO or (YES {SIGMA <value_in_rad>} ) ] }
   *{NO_NET_TRANSLATION  [NO or (YES {station_weight_file})]}
   {NO_NET_TRANSLATION_POSITION [NO or
                       ( {GLOBAL} {LOCAL} {SIGMA <value_in_meters>}
                         [ALL or HORIZ ]
                         {UNIFORM or WEIGHTED}
                         {RIGHT_PART value_1 value_2 value3}
                        {[YES or NO] {EXCEPT (station {station}...\) } } )
   {NO_NET_TRANSLATION_VELOCITY [NO or
                       ( {GLOBAL} {SIGMA <value_in_meters/year>}
                         [ALL or HORIZ ]
                         {UNIFORM or WEIGHTED}
                         {RIGHT_PART value_1 value_2 value3}
                        {[YES or NO] {EXCEPT (station {station}...\) } } )
   {NO_NET_ROTATION_POSITION   [NO or
                       ( {GLOBAL} {LOCAL} {SIGMA <value_in_meters>}
                         {UNIFORM or WEIGHTED}
                         {RIGHT_PART value_1 value_2 value3}
                        {[YES or NO] {EXCEPT (station {station}...\) } } )
   {NO_NET_ROTATION_VELOCITY   [NO or
                       ( {GLOBA} {SIGMA <value_in_meters/year>}
                         {UNIFORM or WEIGHTED}
                         {RIGHT_PART value_1 value_2 value3}
                        {[YES or NO] {EXCEPT (station {station}...\) } } )
 
   {NO_NET_ROTATION_SOURCE      [NO or
                       ( {GLOBAL} {LOCAL} {SIGMA <value_in_rad>}
                         {UNIFORM or WEIGHTED}
                         {[YES or NO] EXCEPT (source {source} ...\) ...} ) }
   {NO_NET_ROTATION_PROPER_MOTION [NO or
                       ( {SIGMA <value_in_rad/sec>}
                         {UNIFORM or WEIGHTED}
                         {[YES or NO] EXCEPT (source {source} ...\) ...} ) }
   STRUCTURE_ADMITTANCE [NO or
                            ([YES SIGMA value])
                        ]
$SUPPRESSION
   {VELOCITIES      [YES or NO or sta_uen]
                    {EXCEPT (sta_uen {station} ...\) ...}}
   {STATIONS        [YES or NO or sta_xyz ]
                    {EXCEPT (sta_xyz {station} ...\) ...}}
   {RIGHT_ASCENSION [YES or NO] {EXCEPT {source ...\}}}
   {DECLINATION [YES or NO] {EXCEPT {source ...\}}}
   {STATION_ORIGIN  [YES or NO] {EXCEPT {station ...\}} }
   {SOURCES         [YES or NO or src_comp]
                    {EXCEPT (src_comp {source} ...\) ...}}
   {PROPER_MOTIONS  [YES or NO or src_comp]
                    {EXCEPT (src_comp {source} ...\) ...}}
   {PRECESSION      [YES or NO]}
   {RELATIVITY      [YES or NO]}
   {DIRECTION       [NO or (YES station_1 TO station_2)]}
   {VELOCITY_ORIGIN [YES or NO] {[HORIZ_ONLY or VERT_ONLY or BOTH or XYZ]}
                                {EXCEPT {station ...\}} }
   {VELOCITY_TIE    [NO  or (YES  (station_list ...\))
                            ({AND (station_list ...\)} ... ) }
   {STATION_TIE     [NO  or (YES  (station_list ...\})
                            ({AND (station_list ...\}) ... }
$ARCS
   {SUPPRESS_FILE [NONE or file_name]
   ARCFILE [NONE or file_name]
   {(DBNAME VER
	    {@<include_file>}
            {ATMOSPHERE_CONSTRAINTS [(AUTO constraint_in_ps/hour) or
                                     (MOST constraint_in_ps/hour) or
                                     (YES  constraint_in_ps/hour) or
                                      IN or
                                      NO]}
            {ATMOSPHERE_FLAGS       [(AUTO INTERVAL interval_in_minutes) or
                                     (MOST INTERVAL interval_in_minutes) or
                                     (YES  INTERVAL interval_in_minutes) or
                                      IN or
                                      NO]}
            {ATMOSPHERE_OFF    [nsites (site1 sites ...)] or [site] or ALL}
            {ATMOSPHERE_OFFSET [nsites (site1 sites ...)] or [site] or ALL}
            {BASDEP_CLO [YES or NO or IN]}
            {CLOCK_CONSTRAINTS      [(AUTO constraint_in_parts_in_1.d-14) or
                                     (MOST constraint_in_parts_in_1.d-14) or
                                     (YES  constraint_in_parts_in_1.d-14) or
                                      IN or
                                      NO]}
            {CLOCK_FLAGS MAX_DEGREE [(IN   [1 or 2]) or
                                     (AUTO [1 or 2]) or
                                     (MOST [1 or 2])   ]
                                    [(AUTO   INTERVAL interval_in_minuts) or
                                     (MOST   INTERVAL interval_in_minutes) or
                                     (FORCE  INTERVAL interval_in_minutes) or
                                      IN or
                                      NO]}
            {CLOCK_REF_SITES [nsites (site1 sites ...)] or [site]}
            {CONTROL_ONLY}
            {ELEVATION cutoff [ALL or {NUM_STA} (station ...)}
            {ED <file_name>}
	    {EOP_DAYOFTIME_EPOCH time}
            {EOP_CONSTRAINT   SIGMA  xp_sigma yp_sigma ut1_sigma}
            {EOPR_CONSTRAINT  SIGMA  xp_rate_sigma yp_rate_sigma ut1_rate_sigma}
            {GRADIENTS_OFF [nsites (site1 sites)] or [site] or ALL}
            [GRADIENT_CONSTRAINTS   [(AUTO constraint_mm constraint_mm/d ) or
                                     (MOST constraint_mm constraint_mm/d ) or
                                     (YES  constraint_mm constraint_mm/d ) or
                                      NO]}
            [GRADIENT_FLAGS          [(AUTO INTERVAL interval_in_hours) or
                                      (YES  INTERVAL interval_in_hours) or
                                      NO]}
            {[MOD_ONLY or CONTROL_ONLY]}
            {[NO_EOP_CONSTRAINT or IN_EOP_CONSTRAINT or
              EOP_CONSTRAINTS  {SIGMA xp_mas    yp_mas    ut1_ms}
              EOPR_CONSTRAINTS {SIGMA xpr_mas/d ypr_mas/d utr_ms/d} ]}
            {NO_EOP_MOD}
            {SOU_EXCLUDE [nsources (source1 sources ...)] or [source]}
            {SOU_OFF     [nsources (source1 sources ...)] or [source]}
            {SOU_USE_DB_IGNORE}
            {STA_EXCLUDE [nsites (site1 sites ...)] or [site]}
            {STA_OFF     [nsites (site1 sites ...)] or [site]}
            {(SUPPRESS_XYULPE <ext_eop_comp_flag>)]}
            {TYPE [GDR    or     GD or    PDR or     PD or
                       GRPRAT or PHSRAT or SNBRAT or GRPONL or PHSONL or
                       SNBONL or RATONL or  G_GXS or PX_GXS or PS_GXS or
                        PX_GX or  PX_GS or  PS_GX or  PS_GS or  P_PXS or
                           GX or     GS or     PX or     PS              ]}
            {VTD_CONF control_file}
   }
 
Notation:
~~~~~~~~~
 
   The symbols used to describe the control file's syntax have the following
meanings:
 
     {}  - contents of braces are optional
     []  - contents of brackets are mandatory
     or  - separates exclusive choices in a []
     ()  - no significance -- groups phrases for clarity
     \   - this grouping may be continued on the next line by ending this line
           with \
     ... - previous object may be repeated
 
     *   - before a keyword means that it is obsolete feature and not
           recommended for use
 
     In addition, readers should keep the following rules in mind:
 
     '_'s (underscores) must be used to represent blanks in station names.
 
   At some places, the user will be required to specify station components
within the XYZ or UEN (Up-East-North) coordinate systems.  These places are
labeled with sta_comp. The components should be specified as XYZ or UEN, with
'-'s (dashes) replacing the unwanted components. The same coordinate system
must be used for sta_comp throughout the control file.
 
   Two related notations, sta_xyz and sta_uen, require the user to specify
components and dashes in the given system.
 
   src_comp requires the user to specify source components, as RD for right
ascension and declination, with '-'s (dashes) replacing unwanted components.
 
   Tab characters should not be placed anywhere in a BATCH control file. BATCH
considers tabs as illegal input.
 
   Comment lines may be placed in the control file, preceded by an asterisk (*).
However, the last line should not be a comment, as this causes sporadic
problems in BATCH.
 
   If the keyword is enclosed in curly brackets {} it can be omitted, BATCH
will not considered this situation as erroneous and makes some default setting.
This feature is provided only for background. IT IS STRONGLY RECOMMENDED TO
SPECIFIES ALL KEYWORDS listed in this manual. No explanation what action
will be done as default is provided.
 
   Anything after a ! on an ARC line is considered to be a comment ( ! must
be the first character of the comment string token(s) ).
 
   $MK5_ROOT  - means the root directory where source code and executables
                of the Mark-5 VLBI Analysis Software System are located.
 
   $SAVE_DIR  - means directory for Solve save files. System-wide default
                defined in $MK5_ROOT/progs/solve/include/gsfcb.i and kept
                in internal variable SOLVE_SAVE_DIR. May be overwritten by
                environment variable SAVE_DIR.
 
   $WORK_DIR  - means directory for Solve work files. System-wide default
                defined in $MK5_ROOT/progs/solve/include/gsfcb.i and kept
                in variable SOLVE_WORK_DIR. May be overwritten by environment
                variable WORK_DIR.
 
   $SOLVE_DIR - means directory for Solve executable files. System-wide
                default defined in $MK5_ROOT/progs/solve/include/gsfcb.i and
                kept in variable SOLVE_PROG_DIR. May be overwritten by
                environment variable SOLVE_DIR.
 
 
Contact:
~~~~~~~~
 
Questions and comments about this guide should be directed to:
 
Leonid Petrov ( Leonid.Petrov@gsfc.nasa.gov )