SHORT_TOLE

    REAL value of the tolerance in position (in radians). The behaviour  differs
    for Short and Zero spacings and  Table or 3-D cubes as Single-Dish data.

    If  the  Single-Dish  data  is a table of spectra, Spectra differing by less
    than this amount will be added together prior  to  gridding.  A  recommended
    value  is  below  1/10th  of the Single Dish primary beam. This is valid for
    Short Spacings and Zero Spacing cases.

    If the Single-Dish data is 3-D data cube, SHORT_TOLE is used only  for  Zero
    Spacings.  If  no  pixel  is within SHORT_TOLE of an Interferometer pointing
    center, no short spacing is added for this field and an error occurs.

      Default value is 0, meaning using  1/16th of the Single Dish primary beam.