Semi-empirical atmospheric models for a bright network element (Vernazza et al. 1981, VAL-E) and a flare (Machado et al. 1980), panels a) and b), are plotted using tabulated results from their respective papers. In the lower panels, c) and d), the heating rate per particle, deposited by streaming electrons in a collisional thick-target regime, is shown as a function of density within the respective model atmosphere, and for both the model ionisation fraction (diamonds) and a modified atmosphere with constant ionisation fraction x = 1 (crosses). The radiative loss rate per particle, n_eΛ(T), at the O v formation temperature is also displayed.