18.21.1 Variables:

The list of control variables is (by alphabetic order, with the corresponding old names used by Mapping on the right)

 New names       [   unit]       -- Description --    % Old Name
 BEAM_STEP       [       ]  Channels per dirty beam  % MAP_BEAM_STEP
 MAP_CELL        [ arcsec]  Image pixel size
 MAP_CENTER      [ string]  RA, Dec of map center, and Position Angle
 MAP_CONVOLUTION [       ]  Convolution function     % CONVOLUTION
 MAP_FIELD       [ arcsec]  Map field of view
 MAP_POWER       [       ]  Maximum exponent of 3 and 5 allowed in MAP_SIZE
 MAP_PRECIS      [       ]  Fraction of pixel tolerance on beam matching
 MAP_ROBUST      [       ]  Robustness factor        % UV_CELL[2]
 MAP_ROUNDING    [       ]  Precision of MAP_SIZE
 MAP_SIZE        [       ]  Number of pixels
 MAP_TAPEREXPO   [       ]  Taper exponent           % TAPER_EXPO
 MAP_UVCELL      [      m]  UV cell size             % UV_CELL[1]
 MAP_UVTAPER     [m,m,deg]  Gaussian taper           % UV_TAPER
 MAP_VERSION     [       ]  Code version (0 new, -1 old)
 MOSAIC_BEAM     [       ]  Mosaic truncation level  % MAP_TRUNCATE

Basic CLEAN parameters

 CLEAN_GAIN       [       ] Loop gain
 CLEAN_STOP       [       ] Stopping criterium (string)
 CLEAN_NITER      [       ] Maximum number of clean components
 CLEAN_FRES       [      %] Maximum value of residual (Fraction of peak)
 CLEAN_ARES       [Jy/Beam] Maximum value of residual (Absolute)
 CLEAN_POSITIVE   [       ] Minimum number of positive components at start
 CLEAN_NKEEP      [       ] Min number of components before convergence

Clean beam user specification

 BEAM_SIZE       [ 0 0 0 ] Major, Minor (in arcsec) and PA (in Degree)

Method dependent CLEAN parameters

 CLEAN_INFLATE    [      ] Maximum Inflation factor for UV_RESTORE (MULTISCALE)
 CLEAN_NCYCLE     [      ] Max number of Major Cycles (SDI & CLARK methods)
 CLEAN_NGOAL      [      ] Max number of comp. in Cycles (ALMA method)
 CLEAN_RATIO      [      ] Smoothing factor (MRC default 0: guess, otherwise must be 2^n)
 CLEAN_SIDELOBE   [      ] Min threshold to fit the synthesized beam
 CLEAN_SMOOTH     [      ] Smoothing ratio: MRC (def 2 or 4)  and MULTISCALE (def sqrt(3))
 CLEAN_SPEEDY     [      ] Speed-up factor (CLARK)
 CLEAN_WORRY      [      ] Worry factor (CLARK and MULTISCALE)

Mosaic related parameters

 MOSAIC_SEARCH    [      ] Threshold to search Clean Comp. in a Mosaic (def 0.2)
 MOSAIC_TRUNCATE  [      ] Threshold to mask outer regions in a Mosaic (def 0.2)

Old (seldom used) names like in MAPPING

 BLC              [  pixel] Bottom left corner of cleaning box
 TRC              [  pixel] Top right corner of cleaning box
 BEAM_PATCH       [  pixel] Size of cleaning beam ** not clear **

Restoration control CLEAN parameters

 CLEAN_RESIDUAL   [-1,0,1]  Control how residuals are added or not - For debug mostly.