2 NAME

The  name  to be printed on the right side of the dirty image and
dirty beam plots (with extensions .LMV and .BEAM).

2 UV__TAPER

Parameters of the tapering function (Gaussian): major axis at 1/e
level [m], minor axis at 1/e level [m], and position angle [deg].

2 WEIGHT__MODE

Weighting  mode: Natural (optimum in terms of sensitivity) or ro‐
bust (usually lower sidelobes) weighting. Use LET WEIGHT__MODE NA
for natural or LET WEIGHT__MODE UN for robust weighting.

The  actual  weighting methods implemented are Natural and Robust
weighting. Robust weighting gives the natural weight to UV  cells
whose  natural  weight  is  lower than a given threshold. In con‐
trast, if the natural weight of the UV cell is larger  than  this
threshold,  the weight is set to this (uniform) threshold. The UV
cell size and the threshold value are contained in  the  UV__CELL
variable.

2 UV__CELL

UV__CELL[1]  :  UV cell size for robust weighting [m].  Should be
of the order of half the dish  diameter  (7.5  m  for  PdBI),  or
smaller.

UV__CELL[2] : Threshold for robust weighting. Default value is 1.
0 means natural weighting and infinite would mean uniform weight‐
ing. Use UV__STAT WEIGHT to choose an educated value.

2 MAP__SIZE

Number  of pixels in X and Y. It should preferentially be a power
of two, (although this is not strictly required) to  fasten  FFT.
MAP__SIZE*MAP__CELL  should  be  at  least  twice the size of the
field‐of‐view (primary beam size for a single field).  Enter  0,0
to let the command find a sensible map size.

2 MAP__CELL

The  map  pixel size [arcsec]. It is recommended to use identical
values in X and Y.  A sampling of at least 3 pixel  per  beam  is
recommended  to ease the deconvolution. Enter 0,0 to let the task
find the best values.

2 MCOL

First and Last channel to image. Values of 0 mean imaging all the
planes.

2 WCOL

The channel from which the weight should be taken.  WCOL set to 0
means using the central channel.

2 CONVOLUTION

Select the desired convolution function for gridding  in  the  UV
plane Choices are
        0    Default (currently 5)
        1    Boxcar
        2    Gaussian
        3    Sin(x)/x
        4    Gaussian * Sin(x)/x
        5    Spheroidal
Spheroidal  functions  is the optimal choice. So we strongly dis‐
courage use of any other convolution function.

2 UV__SHIFT

Logical variable indicating whether map center (i.e. phase track‐
ing center) or orientation should be changed.

2 MAP__RA

New  Right  Ascension of map phase center. Used only if UV__SHIFT
is YES.

2 MAP__DEC

New Declination of map phase center. Used only  if  UV__SHIFT  is
YES.

2 MAP__ANGLE

Position  Angle  of  the direction which will become the apparent
North in the map. Used only if UV__SHIFT is YES.









































