Figure 10: An image of cloudtoground lightning flashes on 11 September 2006 between 0400 and 1200 UTC. Purple crosses are for CG flashes from 0400 to 0600 UTC; blue circles are for flashes from 0600 to 0800 UTC; red squares are for flashes from 0800 to 1000 UTC; yellow triangles are for flashes from 1000 to 1200 UTC. 
