Figure 4From: Top-Down and Bottom-Up Controls on Fire Regimes Along an Elevational Gradient on the East Slope of the Sierra Nevada, California, USASuperposed epoch analysis (SEA) of reconstructed a) PDSI b) NIÑO3 (ENSO) c) PDOG (Gedalof and Smith 2001), d) PDOD (D’Arrigo et al. 2001) with non-fire years and fire years of different extent for the period 1700–1900. Values with filled symbols were statistically significant (P < 0.05).Back to article page