Figure 7: The parameter file for telpars contain the parameters for a focus sequence. Note that these are more easily entered, however, during queries in an actual focus exposure.

cl> lpar telpars
     telfocus = 4805.           Telescope focus
       nfexpo = 7               Number of focus exposures
   freference = 4800.           Focus value
       fdelta = -20.            Focus increment
   (ra_offset = 0.)             RA Offset (arcsec)
  (dec_offset = 0.)             Declination Offset (arcsec)\n\n# PARAMETERS FOR 
      (shtype = "detector")     Shift type
  (fra_offset = 0.)             Focus offset in RA
 (fdec_offset = 20.)            Focus offset in Declination
      (fnrows = 30)             Focus number of rows to reverse shift
       (refis = "middle")       Reference is first, middle or last exposure?
     (focmode = "auto")         Focus mode\n\n# FOR INFORMATION ONLY
     (telname = "wiyn")         Telescope name
     (station = "nf")           Focal station
      (fratio = "f/6.4")        Focal ratio
  (platescale = 9.374)          Plate scale (arseconds/mm)
        (mode = "ql")