Documentation on mospsf

Task: mospsf
Purpose: Determine approximate PSF of a mosaic experiment
Categories: map combination

        MOSPSF is a MIRIAD task which determines the point spread function
        for a linear mosaic of dirty images (as produced by INVERT).

        Strictly speaking, the PSF varies with position and frequency.
        However if the pointing grid is fairly complete and the individual
        synthesised beam patterns are similar, the PSF is reasonably
        independent of position. It is also usually a good approximation
        that it is independent of frequency.

Key: beam
        This gives the name of the input beam-cube (as produced by INVERT).
        No default.

Key: out
        The name of the output point-spread function. It will be the same size
        as the input.

Key: radec
        The RA and DEC (either in the form hh:mm:ss,dd:mm:ss or decimals hours
        and degrees) at which to compute the point-spread function. The default
        is the reference RA,DEC of the beam-cube.

Key: freq
        The frequency (in GHz) at which to compute the point-spread function.
        The default is the reference frequency of the beam-cube. The
        point-spread function is reasonably independent of frequency for most
        spectral line observations.