Tree diagram of fire frequency (FF, the number of fires recorded per pixel from 2002 – 2005) described by landsystem type, tenure type, and distance from road. Length on the vertical axis is proportional to the amount of deviance explained at each branch. The total deviance explained was 24%. Terminal branches (“leaves”) show the mean FF within that branch. ‘N’ is the number of pixels (50% of the total) at each leaf. ‘Droad’ is distance from the pixel to the nearest road in kilometers, ‘MBTA’ is the Mount Bundy defense training area and ‘KNP’ is Kakadu National Park.