Fig. 2From: Systematic review and meta-analysis of fire regime research in ponderosa pine (Pinus ponderosa) ecosystems, Colorado, USAFrequency distribution of site-level mean fire return intervals (n = 78) from 17 studies in ponderosa pine (Pinus ponderosa) ecosystems in Colorado, USA, used in the fire regime meta-analysis of 2017. Vertical dashed line indicates overall meanBack to article page