Table 2 Slopes of flammability score (Principal Component Analysis [PCA] factors 1 and 2) versus drying time for litter mass × infrared heating treatment combinations from pine and oak litter flammability experiments at Humboldt State University Wildland Fire Laboratory, Arcata, California, USA, in July 2017. Factor 1 = PCA factor composed primarily of flame height, smolder time, and consumption. Factor 2 = PCA factor composed primarily of flame time. Shared letters within columns, for species separately, indicate no significant differences between slopes using Tukey multiple comparison test

From: Radiant heating rapidly increases litter flammability through impacts on fuel moisture