tchat  
   lchat  
   logname
   clobber
   dpath
 * cfile1   (task-specific)
   window 
 * epochfo  (task-specific)
 * sepoch   (task-specific)
 * perfo    (task-specific)
 * dper     (task-specific)
 * dpdot    (task-specific)
 * dres     (task-specific)
 * nper     (task-specific)
   nphase  
   nbint  
   nintfm 
   nbdf    
   outfile
   outfileroot
   outfiletype
   plot   
   plotdev
   plotfile
   forcestart
   exposure
   spwinbefore
   spwinafter
   rescale
   offset
 * flatexpo (task-specific)