Thu, 04 Apr 2013 15:54:34 -0400 add shading
Randi [Thu, 04 Apr 2013 15:54:34 -0400] rev 8858
add shading
(0) -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 tip