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Table 2 Fire occurrence information and Natural Fire Rotations (NFR) in years for each of the study areas for the time period 1984–2007.

From: Characterizing Fire-on-Fire Interactions in Three Large Wilderness Areas

   Bob Marshall Selway-Bitterroot Frank Church
Number of years with large fires (yr) 13 15 23
Total number of fires (n) 59 81 187
Burnable area within study area (ha) 1 630 026 876 118 2 365 449
Area burned Proportion of study area burned (%) 24.4 15.3 53.9
NFR (yr) 98 157 44
Area burned only once Proportion of study area burned (%) 23.5 14.3 46.7
NFR (yr) 102 168 51
Area burned more than once Proportion of study area burned (%) 0.9 1 7.3
NFR (yr) 2429 2353 331
Area burned in large fire years Proportion of study area burned (%) 17.9 9.1* 42.4
NFR (yr) 134 263 57
Area burned in non-large fire years Proportion of study area burned (%) 6.5 6.2* 11.5
NFR (yr) 368 386 208
Area re-burned in large fire years Proportion of study area burned (%) 0.7 0.8* 6.5
NFR (yr) 3685 3139 371
Large fire years (>40 500 ha; ranked by most acreage burned) Year 1 2003 2007* 2007
Year 2 1988 1988* 2000
Year 3 2007 2003* 1994
Year 4    1988
Year 5    2006
  1. * In the Selway-Bitterroot Wilderness Area, the 3 years with the highest annual area burned were used since more than 40 500 ha were not burned in any single year.