Ensemble combination weights for the optimization of probabilistic metrics (Table 3, left column) on M-class flare forecasts. Left panel corresponds to combination weights calculated from performance track (see text for details) while middle and right panels correspond to constrained and unconstrained linear combinations, respectively. Weights are presented using the same color scheme as Figure 2 for each forecast method member. Note, ULC weights corresponding to the climatological forecast member are displayed in gray in the right panel.