CLEAN Language

  character(len=20) :: v_clean     ! CLEAN
  ! CLEAN Language versions   v_clean
  v_clean = '4.0-01 08-Mar-2018' ! First IMAGER release with new Variable names (may still change)
  v_clean = '4.1-01 08-Mar-2018' ! IMAGER release with Self Calibration commands
  v_clean = '4.1-02 15-Mar-2018' ! Bug correction in Self Calibration commands
  v_clean = '4.1-02 02-May-2018' ! Split with CALIBRATE\ language 
  v_clean = '4.2-01 03-Jul-2018' ! Add /RANGE options to UV_FILTER and UV_BASELINE
  v_clean = '4.3-01 05-Sep-2018' ! Minor change in SHOW NOISE to identify properly Dirty and Clean data
  v_clean = '4.3-02 05-Nov-2018' ! Debug MX, improve MULTI and cleanup messages  
  v_clean = '4.3-03 14-Nov-2018' ! Add the UV_TRIM command, support READ CCT /RANGE
  v_clean = '4.4-01 14-Jan-2019' ! Add the UV_HANNING command
  v_clean = '4.4-02 17-Jan-2019' ! Add the UV_EXTRACT command
  v_clean = '4.4-03 04-Feb-2019' ! Add the /FILE option to UV_BASELINE,UV_FILTER, UV_SPLIT and UV_SORT
  v_clean = '4.4-04 07-Feb-2019' ! Bug correction in UV_MAP for Phase offset mosaics 
  v_clean = '4.4-05 08-Feb-2019' ! UV_TRIM /FILE syntax
  v_clean = '4.4-06 12-Feb-2019' ! Protect against incomplete UV data (Nvisi < dim(2))
  v_clean = '4.4-07 13-Feb-2019' ! Operational version of UV_SORT /FILE (still slow)
  v_clean = '4.4-08 14-Feb-2019' ! Operational version of UV_SORT /FILE (reasonable now) 
  v_clean = '4.4-09 15-Feb-2019' ! UV_TIME /FILE syntax
  v_clean = '4.4-10 25-Feb-2019' ! UV_RESAMPLE, UV_COMPRESS, UV_HANNING /FILE syntax
  v_clean = '4.5-01 27-Feb-2019' ! Move STOKES command to ADVANCED\ language
  v_clean = '4.5-02 14-Mar-2019' ! Improve the STATISTIC and SUPPORT commands behaviour 
  v_clean = '4.5-03 29-Mar-2019' ! Support for SHOW SOURCES
  v_clean = '5.0-01 05-Apr-2019' ! Remove CLARK, ..., SDI commands, leave only CLEAN
  v_clean = '5.0-02 05-Apr-2019' ! Move COLOR to CLEAN\
  v_clean = '5.0-03 29-Apr-2019' ! Option /CONT for UV_MAP
  v_clean = '5.0-04 02-May-2019' ! BUFFERS command
  v_clean = '5.0-05 06-May-2019' ! /NOPAUSE option to VIEW command
  v_clean = '5.0-06 07-May-2019' ! UV_STAT DEFAULT and associated variables
  v_clean = '5.0-07 25-May-2019' ! /INDEX option for UV_MAP
  v_clean = '5.1-01 05-Jun-2019' ! Command UV_REWEIGHT re-written
  v_clean = '5.1-02 15-Jun-2019' ! UV_EXTRACT /FIELDS
  v_clean = '5.1-03 25-Jun-2019' ! UV_FIELDS command 
  v_clean = '5.1-04 03-Jul-2019' ! UV_COMPRESS /CONTINUUM option
  v_clean = '5.1-05 04-Jul-2019' ! Remove obsolete /SELF option of UV_MAP & UV_RESTORE
  v_clean = '5.2-01 03-Sep-2019' ! Move STATISTIC command out of this language
  v_clean = '5.2-02 13-Sep-2019' ! Move UV_SORT command out of this language
  v_clean = '5.2-03 25-Sep-2019' ! UV_FLAG bug correction
  v_clean = '5.2-04 07-Oct-2019' ! UV_MAP 'Map_Center' bug correction (header not updated)
  v_clean = '5.2-05 10-Oct-2019' ! WRITE does not accept ambiguities
  v_clean = '5.2-06 10-Oct-2019' ! VIEW with no argument just re-displays
  v_clean = '5.3-01 10-Oct-2019' ! Support for the CONTINUUM image
  v_clean = '5.3-02 11-Oct-2019' ! MAP_REPROJECT, MAP_COMBINE commands (+syntax MAP_RESAMPLE)
  v_clean = '5.3-03 13-Oct-2019' ! SHOW /NOPAUSE and VIEW /OVERLAY commands
  v_clean = '5.3-04 16-Oct-2019' ! SHOW /SIDE instead of /NOPAUSE and new MASK THRESHOLD command
  v_clean = '5.3-05 06-Nov-2019' ! /FILE option of UV_CHECK
  v_clean = '5.3-06 20-Nov-2019' ! /FILE option of UV_SHIFT
  v_clean = '5.3-07 06-Feb-2020' ! Bug correction for MAP_COMPRESS syntax
  v_clean = '5.3-08 20-Feb-2020' ! Size computation for Large data set may exceed 2GBytes
  v_clean = '5.3-09 21-Feb-2020' ! Bug correction for Mosaic in Robust weighting 
  v_clean = '5.3-10 24-Feb-2020' ! /LIKE option of MAP_RESAMPLE
  v_clean = '5.3-11 05-Mar-2020' ! Bug correction in MULTI
  v_clean = '5.3-12 05-Mar-2020' ! Bug correction about buffers selected by UV_SELECT and/or UV_MAP /CONT
  v_clean = '5.3-13 11-Mar-2020' ! Bug correction in MAP_RESAMPLE (overflow of channel ranges)
  v_clean = '5.3-14 25-Mar-2020' ! Remove a restriction in MAP_RESAMPLE (overflow of channel ranges)
  v_clean = '5.3-15 25-Mar-2020' ! Improve the /FLUX display in CLEAN command
  v_clean = '5.3-16 13-May-2020' ! Improve the WRITE MODEL command 
  v_clean = '5.4-01 21-May-2020' ! /FOR option of SPECIFY
  v_clean = '5.4-02 09-Jul-2020' ! Command DISCARD
  v_clean = '5.4-03 01-Sep-2020' ! Option /THRESHOLD for command FIT
  v_clean = '5.4-04 03-Sep-2020' ! Improve UV_TIME command : more consistent defaults
  v_clean = '5.4-05 11-Sep-2020' ! Bug correction in MASK APPLY (Blanking was not updated)
  v_clean = '5.4-06 15-Sep-2020' ! Optimize MAP_RESAMPLE if no resampling needed
  v_clean = '5.5-01 26-Oct-2020' ! Command UV_SMOOTH
  v_clean = '5.6-01 07-Dec-2020' ! Command CCT_MERGE and CCT_CONVERT
  v_clean = '5.6-02 14-Dec-2020' ! STATISTIC /EDGE option
  v_clean = '5.6-03 14-Dec-2020' ! /ARES Argument must be Real array
  v_clean = '5.6-04 14-Jan-2021' ! Debug VIEW and SHOW 4-D Beams
  v_clean = '5.6-05 19-Jan-2021' ! Make sure UV_MAP works on Mosaics even in Memory limited conditions
  v_clean = '5.7-01 31-Jan-2021' ! Command CCT_CLEAN
  v_clean = '5.7-02 31-Mar-2021' ! FIT command make one fit per pointing
  v_clean = '5.7-03 01-Apr-2021' ! MULTISCALE is now operational for Mosaics
  v_clean = '5.7-04 01-Jun-2021' ! Bug correction for MULTISCALE in 4-D Beams
  v_clean = '5.7-05 01-Jun-2021' ! More flexible FIT command
  v_clean = '5.8-01 17-Jun-2021' ! SPECIFY FREQUENCIES command for VLA data
  v_clean = '5.8-02 28-Jun-2021' ! UV_SHIFT bug correction for "false" mosaics (ID and MOFF columns)
  v_clean = '5.8-03 28-Jun-2021' ! UV_SORT bug correction for /FILE option
  v_clean = '6.0-00 21-Oct-2021' ! Split Language CLEAN\ into CLEAN\ and DISPLAY\ (no \at end please...)
  v_clean = '6.0-01 09-Nov-2021' ! Bug correction in READ UV: undefine PREVIEW%, avoid write UV data in WRITE *
  v_clean = '6.1-00 17-Nov-2021' ! Add /JVM option to command FIT
  v_clean = '6.1-01 17-Nov-2021' ! CLEAN Variable ? syntax
  v_clean = '6.1-02 17-Nov-2021' ! UV_MAP Variable ? syntax
  v_clean = '6.1-03 19-Nov-2021' ! UV_REWEIGHT syntax bug correction
  v_clean = '6.1-04 23-Nov-2021' ! Use the BEAM_JVM value in UV_RESTORE - (Defaults to 1 if not available)
  v_clean = '6.2-00 02-Dec-2021' ! Add the /LIKE option to UV_RESAMPLE 
  v_clean = '6.2-01 16-Dec-2021' ! Optimize parallel processing
  v_clean = '6.2-02 17-Dec-2021' ! Debug MAP_BEAM_STEP = 1 mode
  v_clean = '6.2-03 17-Dec-2021' ! UV_CHECK beam works better
  v_clean = '6.2-04 18-Dec-2021' ! UV_TIME now works for UV tables with per-channel weights
  v_clean = '6.2-05 20-Dec-2021' ! UV_RESAMPLE must reset BEAM_RANGES variable
  v_clean = '6.3-00 21-Dec-2021' ! Use new way of defining Dirty Beams number and properties.
  v_clean = '6.3-01 03-Jan-2021' ! Parallel programming optimization for CLEAN
  v_clean = '6.3-02 06-Jan-2022' ! Allow direct READ of FITS data cubes.
  v_clean = '6.3-03 07-Jan-2022' ! READ /PLANES option now works as expected
  v_clean = '6.3-04 11-Jan-2022' ! UV_FIELD bug correction 
  v_clean = '6.3-05 18-Jan-2022' ! READ SINGLE bug correction
  v_clean = '6.3-06 20-Jan-2022' ! READ  with FITS format improvement
  v_clean = '6.3-07 08-Feb-2022' ! Allow to use Fixed beamsize in UV_RESTORE
  v_clean = '6.3-08 08-Feb-2022' ! CLEAN_STOP syntax in CLEAN
  v_clean = '6.3-09 07-Mar-2022' ! Allow WRITE BEAM /APPEND in all cases
  v_clean = '6.3-10 07-Mar-2022' ! Bug correction in beam derivation if ANGLE is specified
  v_clean = '6.3-11 09-Mar-2022' ! Bug correction in CCT_MERGE : Concatenation was improper
  v_clean = '6.4-00 18-Mar-2022' ! Implement the /RESTART option of CLEAN
  v_clean = '6.4-01 22-Mar-2022' ! Flag out of band channels in UV_RESAMPLE
  v_clean = '6.4-02 03-May-2022' ! /RESET option of UV_FILTER
  v_clean = '6.4-03 10-May-2022' ! Bug correction in UV_SHIFT and PROPER_MOTION
  v_clean = '6.4-04 02-Jun-2022' ! Make SPECIFY TELESCOPE work on Images too
  v_clean = '6.4-05 09-Jun-2022' ! Debug UV_FLAG command
  v_clean = '6.4-06 29-Jun-2022' ! Make UV_EXTRACT work with Random Frequency Axis
  v_clean = '6.4-07 29-Jun-2022' ! Make READ handle properly Random Frequency Axis in UVFITS format
  v_clean = '6.5-00 05-Sep-2022' ! Add the /ASYMMETRIC option of MAP_SMOOTH and UV_SMOOTH
  v_clean = '6.5-01 27-Sep-2022' ! Add the UNIT specifier to MAP_REPROJECT
  v_clean = '6.5-02 07-Oct-2022' ! Bug correction in Beam Consistency checking
  v_clean = '6.5-03 10-Oct-2022' ! Use a Channel mask array to hide line-emitting parts of the spectrum
  v_clean = '6.5-04 07-Nov-2022' ! Make sure MAP_CENTER is also used for Mosaics
  v_clean = '6.5-05 14-Nov-2022' ! Bug in UV_SHIFT: Pointing center was incorrectly reset in /FILE option for single fields
  v_clean = '6.5-06 14-Nov-2022' ! Bug in UV_MOSAIC: Wrong identification of arguments
  v_clean = '6.5-07 14-Nov-2022' ! Make sure MAP_CENTER is never forgotten (Mosaic stills needs checking)
  v_clean = '6.5-08 15-Nov-2022' ! UV_TIME crashed on Mosaics
  v_clean = '6.6-00 19-Dec-2022' ! Prepare UV_MAP with Sault Method for Mosaics, using the MOSAIC command
  v_clean = '6.6-01 05-Jan-2023' ! Working version of UV_MAP with Sault Method for Mosaics, using the MOSAIC command
  v_clean = '6.6-02 05-Jan-2023' ! all "TRUNCATE" values are now in [0,1] (instead of % in some options before)
  v_clean = '6.6-03 20-Feb-2023' ! MAP_CONVOLVE now preserves flux when possible. MAP_RESAMPLE handles blanking.
  v_clean = '6.6-04 23-Feb-2023' ! UV_STAT better handles Recommended vs User specified sizes
  v_clean = '6.6-05 03-Mar-2023' ! UV_CHECK uses BEAM_TOLERANCE
  v_clean = '6.6-06 03-Mar-2023' ! Bug correction in UV_SHIFT for degenerate 1 field Mosaic
  v_clean = '6.6-07 08-Mar-2023' ! Bug correction in READ for FITS files (file left open in optimized case)
  v_clean = '6.6-08 08-Mar-2023' ! UV_CHECK BEAM uses an improved method (ignore per-channel scale factors)
  v_clean = '6.6-09 15-May-2023' ! PRIMARY command syntax improved, backward compatible
  v_clean = '6.6-10 25-May-2023' ! UV_REWEIGHT bug correction
  v_clean = '6.7-00 06-Jun-2023' ! LOG command
  v_clean = '6.7-01 10-Jun-2023' ! Bug correction for UV_RESTORE in Mosaics.
  v_clean = '6.7-02 07-Jul-2023' ! READ UV in UVFITS format was broken on Mosaics.
  v_clean = '6.7-03 07-Jul-2023' ! SPECIFY /FOR was not working
  v_clean = '6.7-04 13-Jul-2023' ! Improvements and Bug corrections in UV_STAT
  v_clean = '6.7-05 13-Jul-2023' ! READ Item FileFilter opens a file search window
  v_clean = '6.7-06 28-Aug-2023' ! SPECIFY command syntax: BLANKING, FREQUENCY and SPECUNIT
  v_clean = '6.7-07 04-Sep-2023' ! Introduce BEAM_GAP and verify Weight channel more clearly
  v_clean = '6.7-08 06-Sep-2023' ! DUMP MEM command and IMAGER_RAM variable
  v_clean = '6.7-09 07-Sep-2023' ! Proper handling of Memory limit in UV_RESTORE and UV_RESIDUAL - Sault Mosaic to be done
  v_clean = '6.7-10 04-Oct-2023' ! UV_CHECK improvements and UV_CONTINUUM using the Code_uvt_IF flag
  v_clean = '6.7-11 18-Oct-2023' ! CCT_CONVERT flux scale correction
  v_clean = '6.7-12 20-Oct-2023' ! CLEAN /RESTART bug correction
  v_clean = '6.7-13 13-Nov-2023' ! MAP_COMBINE INDEX bug correction
  v_clean = '6.7-14 09-Jan-2024' ! Ensure flagged data are not used in Robust weighting estimate
  v_clean = '6.8-00 05-Mar-2024' ! Improved PRIMARY command, WRITE CCT /APPEND support
  v_clean = '6.8-01 08-Mar-2024' ! Debug UV_PREVIEW for Confused spectra
  v_clean = '6.8-02 10-Mar-2024' ! Update fits-to-uvt.ima and debug UV_REWEIGHT /FILE