NAME:
  occmodel
 PURPOSE:   (one line only)
  Compute a synthetic occultation profile
 DESCRIPTION:
 CATEGORY:
  Occultations
 CALLING SEQUENCE:
  occmodel,time,time1,time2,model,error
 INPUTS:
  time  - vector of time for the samples, this value references the middle of
           the sample
  time1 - time of disappearance, same units as "time"
  time2 - time of reappearance, same units as "time"
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  model - synthetic occultation profile, values are mostly either 0 or 1.  For
             the transition points, the flux is between 0 and 1 depending on
             where the transition is between the time interval of the point.
 KEYWORD OUTPUT PARAMETERS:
 CONFIGURATION:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2020/03/29