15.15.5 FROM|TO|BY|N

You may also specify a range of contours with FROM,TO,BY,N. You may specify any 3. The maximum number of contours you may specify at once is 100. example TD:CONTOUR FROM 1 TO 10 BY 2 or... TD:CONTOUR FROM 1 BY 2 N=5 or.. TD:CONTOUR 1,3,5,7,9 Draws contour lines at 1,3,5,7, and 9.