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Fig. 4 | Fire Ecology

Fig. 4

From: Systematic review and meta-analysis of fire regime research in ponderosa pine (Pinus ponderosa) ecosystems, Colorado, USA

Fig. 4

Variability of site-level mean fire return interval by two elevation groups (<2400 m, n = 24; and >2400 m, n = 54) from 17 fire history studies on ponderosa pine (Pinus ponderosa) in Colorado, USA, used in the fire regime meta-analysis of 2017. The horizontal line in the middle of each box represents the median value (50th percentile), the ends of the boxes are the first (Q1) and third (Q3) quartiles, which cover the central 50% of the data, and the difference between Q3 and Q1 is the interquartile range (IQR). The notches are an approximation of the 95% confidence interval for the median values. Vertical lines extend to the most extreme data points that are no more than ±1.5 × IQR, and outliers beyond the lines are individually displayed as dots

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