Values of log(﹩{{L}_{{\rm H}\alpha }}/{{L}_{{\rm bol}}}﹩) as a function of spectral type. The inner (dark gray) shaded box represents the interquartile range, while the outer (light gray) shaded box represents the entire range. Left panel: values taken from Figure 6, selected to overlap with the ﹩{{T}_{{\rm eff}}}﹩ values of the model grid. Right panel: values that have been modified to examine the effect of the biases described in Section 7.