tchat  
   lchat  
   logname
   clobber
   dpath
   cfile1        (task-specific)
   window 
   dtnb   
   nbint  
   nintfm 
   rebin  
   nbdf    
   itre   
   itremo 
   outfile
   outfileroot
   outfiletype
   plot  
   plotdev
   plotfile
   gapfill
   forcestart
   errorbars     (task-specific)
   exposure
   normalization (task-specific)
   spwinbefore
   spwinafter
   rescale
   offset