UV_SHORT Algorithm

    UV_SHORT task computes pseudo-visibilities for short or zero spacings from a
    single dish table of spectra (Class table) or LMV data cube.   These  pseudo
    visibilities are  appended to the current (presumably a Mosaic) UV table.


    Short spacings are computed when the Interferometer dish diameter is smaller
    than  the  Single-dish  diameter, Zero spacings otherwise (see HELP UV_SHORT
    Zero_Spacing for this case)

    For short spacings, the command performs two steps
      (1) Creation of a "well behaved" map from the spectra.
      (2) Extraction of UV visibilities from this map.

    See HELP UV_SHORT Step_i for detailed explanations of the method steps.

    With recent UV tables and Single Dish CLASS table, most parameters are auto-
    matically  determined.  The  only  parameter   to   be   specified   remains
    SHORT_SD_FACTOR  (although  that one may also be determined automatically if
    the input single dish data set is in main-beam brightness temperature).

    A parameter set to 0 value indicates the appropriate default should be used.