UV_FITC

        UV_FITC :  Fit spherically symmetric models to a UV data set

    This  task  allows  fitting  of  simple   models   directly   from   the
    visibilities.   The   models   are   linear  combinations  of  2  radial
    distributions, assumed to be centered  on  the  current  phase  tracking
    center. Use tasks UV_CENTER and UV_SHIFT if necessary before fitting.


    OLD VERSION: there is a sign error....


    The type of the first radial distribution. Available types are
        NONE      No function to fit (for 2nd function usually)
        POINT     Point source
        GAUSS     Gaussian sources
        DISK      Disk
        RING      Annulus
        EXPONENT  Exponential brightness
        POWER-1   B = 1/r
        POWER-2   B = 1/r^2
        POWER-3   B = 1/r^3
        PARABOLA  Parabolic brightness distribution