NAME:
     Z2GIF
 PURPOSE:
     dump a Z-buffer image to a .gif file 
 CATEGORY:
 CALLING SEQUENCE:
     z2gif, outfil=outfil
     z3gif, outfil=outfil, ct=-0
 INPUTS:
 OPTIONAL (KEYWORD) INPUT PARAMETERS:
     ct, the color table by IDL number (reversed if negative), default 15
     over, reverses the color table (needed for ct=0!)
 OUTPUTS:
 CALLS: ***
	LOADCT, OVER, WDEF [1], WDEF [2], WRITE_GIF
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 MODIFICATION HISTORY:
     30-dec-99, hsh
     14-feb-01, hsh, defaulted input to tvrd()
     22-may-01, hsh, added /over

 NAME:
     ZOOM_CONT
 PURPOSE:
     Extract a zoomed image and make a contour of it
 CATEGORY:
     Yohkoh
 CALLING SEQUENCE:
     zoom_cont, index, img, levels=levels, hardcopy = hardcopy, cont = cont,
       limb = limb
 INPUTS:
     an image
 OPTIONAL (KEYWORD) INPUT PARAMETERS:
       cont : allows continuous zoom function for scanning acros img
     levels : vector specifying contour levels
   hardcopy : print copy of contour plot if set
       limb : trace limb location
 OUTPUTS:
 CALLS: ***
	HH_DELETE
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 MODIFICATION HISTORY:
     HSH 14-oct-94, written
      DA 14-oct-94, fixed
     HSH 15-oct-94, re-fixed and added limb keyword

 NAME:
	ZOOM_CONT2
 PURPOSE:
       zoom out contours for parts of FFIs, do hardcopy etc.
 CATEGORY:
       Yohkoh
 CALLING SEQUENCE:
       zoom_cont2,index,data
 INPUTS:
 	half-resolution image and index
 OPTIONAL (KEYWORD) INPUT PARAMETERS:
       limb: adds limb trace
       hardcopy: prints
       levels: contour levels
       side: zoom factor - default 128 is a factor of 4 
 OUTPUTS:
 CALLS: ***
	HH_DELETE
 COMMON BLOCKS:
 SIDE EFFECTS:
       destroys most of your existing windows
 RESTRICTIONS:
 MODIFICATION HISTORY:
       HSH, DA written 15-oct-94

 NAME:
     ZS_CONTOUR
 PURPOSE:
     make a contour plot with square format and print it on lpr
 CATEGORY:
     Yohkoh
 CALLING SEQUENCE:
     zs_land, img
 INPUTS:
     two-D image
 OPTIONAL (KEYWORD) INPUT PARAMETERS:
 OUTPUTS:
 CALLS: ***
	HH_DELETE, ZS_CONT
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 MODIFICATION HISTORY:
     HSH, written 14-oct-94