Up: Description of Associated Tasks
Task to "refine" the imaging process.
The zeroth order in imaging is to compute a single gridding and beam
for all channels, at the center frequency: this is the standard way of
making imaging. Strictly speaking, it produces an angular scale inverse-
ly proportional to frequency. This is obtained by setting ONEBEAM$ to NO
(and BCOL$ = 0) in the imaging tasks.
The infinite order is to compute one beam per channel, obtained by
stting ONEBEAM$ to YES, but it is a costly process as gridding is to be
redone for each channel.
This task is here for the first order correction of the angular scale
varying with frequency, just making a linear interpolation between im-
ages computed with two different gridding because of the angular scale.
The images (or beams) are assumed to be computed for the frequencies of
the 2 extreme channels.
These files (.lmv and .beam) can be prepared by running twice the
tasks UV_MAP or UV_INVERT with parameter BCOL$ set to 1 and the number
of channels respectively on each execution.