For each photosphere ﹩{{T}_{{\rm eff}}}﹩, log(﹩{{L}_{{\rm H}\alpha }}/{{L}_{{\rm bol}}}﹩) is shown as a function of chromosphere break for a range of chromospheric filling factors (colors given in the bottom right). The uncertainties in log(﹩{{L}_{{\rm H}\alpha }}/{{L}_{{\rm bol}}}﹩) are based on varying ﹩{{T}_{{\rm eff}}}﹩ by ±200 K, as discussed in the Appendix.