;+
;
; @file_comments
; Apply GMT palette into IDL color/intervals system
;
; @categories
;
; @param MIN {in}{required}
; A real number specifying above what value we want to trace a contour
;
; @param MAX {in}{required}
; A real number specifying below what value we want to trace a contour
;
; @param INTERVALLE
;
; @param NCOUL
;
; @param NCONTOUR {out}
; Number of contour to be drawn.
;
; @param LEVEL_Z2D {in}{required}
; Vector containing values of isolignes to be traced.
;
; @param COUL
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;
;-
PRO label_gmt, min, max, intervalle, ncoul, ncontour, level_z2d, coul
;
  compile_opt idl2, strictarrsubs
;
@common
@com_eg

   IF pal_type NE '2dom' THEN BEGIN

;  color defined in lec_pal_gmt.pro

      ncontour = ncont_gmt
      level_z2d = levels_gmt
      coul = coul_gmt
      max = max_gmt
      intervalle =  -1

   ENDIF ELSE BEGIN

      ; grey_shade palette (case 1 in label)
      IF finite(min) EQ 0 THEN read, ' Grey shade needs a min,max :', min, max
      ncontour  = fix((max-min)/intervalle)
      level_z2d = min + intervalle*findgen(ncontour)
      max=level_z2d[ncontour-1]+intervalle

      ras = report(['     Number of contour intervals, plotting min & max ' + $
string(ncontour) + string(min)+ string(max),' '])

      ; color index

      IF idx_pal EQ 0 THEN BEGIN

         ; build palette
         red = lonarr(99)
         red[*] = 255
         red[50:98] = long((100.-float(grey_shade))/100.*255.)

         IF field.origin EQ 'diff' THEN BEGIN

           ; difference plot : lighter below first negative interval
            red[51:98] = long((100.-float(grey_shade_2))/100.*255.)
            red[1:48] = long((100.-float(grey_shade))/100.*255.)
            red[50] = 255

         ENDIF

         ; first color=black
         ; last = white
         red = [0, red]
         red[99] = 255
         ; gray scale
         green = red
         blue = red

         tvlct, red, green, blue

      ENDIF

      mid_index = max(where(level_z2d LE fldatt.mid))
      coul = findgen(ncontour)+49-mid_index +2

   ENDELSE
END