Fig. 4

Variation in the mean forward rate of fire spread (R) and error statistics for the 10% wind speed rule of thumb per broad burning condition. MC is the fine dead fuel moisture content (low < 7.5%; high > 7.5%), U₁₀ is the 10-m open wind speed (moderate < 30 km h⁻¹; high > 30 km h⁻¹), MAE is the mean absolute error, MBE is the mean bias error and MAPE is the mean absolute percent error