Logarithm of the Lyα line contribution functions (top row) and optical depths (bottom row) after the beam injection. The logarithm of column depth is shown on the x-axis, and the wavelength relative to the line centre (1216 Å) is shown on the y-axis. The contributions to the Lyα emission intensity are shown in panel a at 30 s in the F10 model and panel b at 90 s in the F12 model. The colour scale runs from light (low contribution) to dark (high contribution) in the log(contribution function + 1) panels, and the relevant plasma macro-velocity profiles are scaled to their resulting Doppler shifts, and subsequently plotted over the top of the contribution functions using a green line. Bottom panels: logarithmic scale optical depths at similar times. The optical depths are shown starting from a value of τ = 1 (blue) and increasing to an optical depth of > 10⁹ in the line centre at the base of the model (yellow).