THTELN

     THTELN specifies the color, line type, line width, minimum, maximum, 
     and increment for the background moist adiabats (equivalent potential 
     temperature lines) on thermodynamic diagrams:

	line color / line type / width / minimun / maximum / increment

     The values must be separated by slashes.  If THTELN is blank, no
     lines will be drawn.