Grid from:
Tie et al.,Effect of Clouds on Photolysis and Oxidants
in the Troposphere , accepted in JGR, 2003.
iw		wl		wc		wu
1.       	178.6       	179.3       	180.0
2.       	180.0       	181.5       	183.0
3.       	183.0       	185.0       	187.0
4.       	187.0       	189.5       	192.0
5.       	192.0       	195.0       	198.0
6.       	198.0       	201.5       	205.0
7.       	205.0       	209.0       	213.0
8.       	213.0       	217.5       	222.0
9.       	220.0       	226.5       	231.0
10.       	241.0       	265.5       	289.9
11.       	289.9       	297.7       	305.5
12.       	305.5       	309.5       	313.5
13.       	313.5       	325.5       	337.5
14.       	337.5       	378.8       	420.0
15.       	420.0       	447.5       	475.0
16.       	475.0       	602.0       	729.0
17.       	729.0       	736.3       	743.6