Statistical equilibrium populations of hydrogen, comparing the Sollum radiative rates with a detailed calculation using the RH code. Panel (a) shows the temperature and electron density of the FAL-C atmosphere. Panel (b) compares the ionisation fraction and panel (c) the n² populations. These are shown for LTE (dashed red lines) and the Sollum radiative rates (dashed blue lines) as well as from two detailed calculations with the RH code, one that treats Lyman lines in detailed balance (dashed green lines) and a second that calculates the radiative rates for the Lyman lines (solid black lines; see the legend in panel c).