NAME:
  occtsig
 PURPOSE:   (one line only)
  Estimate occultation event timing uncertainty
 DESCRIPTION:

  Must first run occtime to get the nominal timing values.
 CATEGORY:
  Occultations
 CALLING SEQUENCE:
  occtsig,fnlc
 INPUTS:
  fnlc - Name of lightcurve file.  The data are expected to be in tabular
           format, space separated.  The first column is often the point
           number but is not used by this program.  Only these columns are
           used:
           col 2 - Julian Date of lightcurve measurement (mid-time, UTC)
           col 3 - Flux from target star, usually normalized

           Anything after column 3 is ignored but usually contains
             then non-normalized flux, x,y position, and FWHM in pixels.

 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
  INFO - anonymous structure with various results from the calculation
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2020/03/24