The UV_MAP command is controlled by a set of SIC variables of names starting by MAP_
MAP_ANGLE Position angle of map axis when MAP_SHIFT is set
MAP_BEAM_STEP Number of channels per common dirty beam, if. If 0, only one
beam is produced in total. If, an automatic guess is performed
from the map size and requested precision (MAP_PRECIS).
MAP_CONVOLUTION Convolution mode (default 5) (old name CONVOLUTION)
MAP_CELL Pixel size in arcsecond
MAP_DEC Declination of new map center
MAP_FIELD Image size in arcsecond
MAP_PRECIS Position precision at edge of image, in fraction of pixel size. Default
is 0.1.
MAP_POWER Rounding scheme for default image size, to numbers like 2n 3p 5q.
p and q are less or equal to MAP_POWER.
MAP_RA Right ascension of new map center
MAP_ROBUST Robust weighting factor, in range 0 - infty. Default 1.0. (Old name
UV_CELL[1])
0 means Natural weighting (as infty, actually)
MAP_ROUNDING Tolerance to round image size by floor instead of ceiling.
MAP_SHIFT Logical indicating whether the phase center must be shifted and/or
the image rotated (old name UV_SHIFT).
MAP_SIZE Image size in pixels
MAP_TAPEREXPO the taper exponent. Default 2 (Old name TAPER_EXPO).
MAP_UVCELL UV Cell size for Robust weighting. Default is 0, meaning that the
cell size is derived from the antenna diameter. (Old name
UV_CELL[2])
MAP_UVTAPER Array of 3 values giving the UV taper in m (first two values), its
position angle (third value). Default (0,0,0). (Old name
UV_TAPER[3]).
MAP_VERSION Version of code to be used. This is a temporary variable to allow
comparison between the new and old codes without quitting
MAPPING.
In addition, WCOL indicates the weight channel and MCOL the channel range to be imaged. However, WCOL should in general be set to zero to allow the beam steps to be set.
The old code can still be executed by setting MAP_VERSION = -1. MAP_VERSION set to 0 (the default) uses the new code, and MAP_VERSION = 1 allows access to an intermediate version.