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Table 1 Covariates used in generalized additive models (GAMs) to assess variation in post-fire fuels nine years after the Storrie Fire

From: Fuel dynamics and reburn severity following high-severity fire in a Sierra Nevada, USA, mixed-conifer forest

Model covariateMean (min–max) or class (n)Source
Elevation (m)1440 (838–1989)US Geological Survey (2013)
Topographic position indexCanyon (21), flat slope (6), steep slope (117), ridge (58)Derived from the digital elevation model using CorridorDesigner Toolbox (Majka et al. 2007)
Slope steepness (%)51.1 (4.7–136.5)Derived from the digital elevation model
Solar radiation (WHm−2 × 105)13.1 (5.7–16.8)Derived from the digital elevation model using the Solar Radiation Toolbox in ArcGIS 10.3 (ESRI 2014)
Slope aspect (transformed)1.03 (0–2)Derived from the digital elevation model, transformed as 1 + cos(45−A)(π ÷ 180), where A is the aspect in degrees
Actual evapotranspiration385 (293–534)The basin characterization model downscaled climate and hydrology datasets (Flint et al. 2013)
Climatic water deficit582 (359–703)The basin characterization model downscaled climate and hydrology datasets (Flint et al. 2013)