pro tvrange, data, boundaries, x, y, saturate=saturate, z=z
  if keyword_set(saturate) then begin
     z=linterp(double(boundaries[0]),0d,double(boundaries[1]),255d,data>boundaries[0]<boundaries[1])
  end else begin
     z=linterp(double(boundaries[0]),0d,double(boundaries[1]),255d,data)
  end
  ; The IDL The TV procedure displays images in a Direct Graphics window without scaling the intensity.
  tv,z,x,y
end