Logarithms of total basic cross sections σ_α (solid lines), α = −1,0, + 1 marked “(−)”, “(0)”, and ”(+)”, respectively. For comparison, the logarithms of cross sections without contribution of excited bound states (dotted lines) and free-free cross sections (dashed lines) are plotted. The three panels correspond to three sets of plasma parameters ρ, T, and B marked on the plots. The arrows correspond to different characteristic transition energies for a nonmoving H atom (see text for discussion): 0 – E_0,0 (the principal photoionization threshold), 1 – (E_0,0 − E_1,0), 1′ – (E_0,0 − E_2,0), 1′′ – (E_0,0 − E_3,0), 2 – (E_1,0 − E_2,0), 2′ – (E_1,0 − E_3,0), 3 – (E_2,0 − E_3,0), 4 – (E_3,0 − E_4,0), 5 – (E_4,0 − E_5,0); 1a – (E_0,0 − E_0,1), 2a – (E_1,0 − E_1,1), 3a – (E_2,0 − E_2,1). The arrows marked c0, c1, c2, c3, c4 correspond to cyclotron harmonics energies (N + 1)ħω_ce with N = 0,1,2,3,4, respectively.