Table 1 Historic mean annual number of wildfire ignitions (1990 to 2009) in the resource-objectives wildfire start zone (N_H), designated fraction of wildfire ignitions to be managed for resource objectives (F_RO), and expected annual number of wildfires managed for resource objectives (N_RO) by month of fire start. N_RO is the product of N_H and F_RO.

From: Quantifying the Threat of Unsuppressed Wildfires Reaching the Adjacent Wildland-Urban Interface on the Bridger-Teton National Forest, Wyoming, USA