Inversion maps of Event A considering both Ca II 8542 Å and Ca II K. The same format is used as for Fig. 3, except that the right-hand panels in the lower two rows now show the synthetic and observed Ca II K intensity images (at the specified wavelength offsets) and those in the upper two rows (i.e. Ca II 8542 Å) have been multiplied by a factor 1.25 to offset the intrinsic intensity difference between both calcium lines. The coloured plus symbols in the right-hand column indicate the locations for which similarly coloured profiles are shown in Fig. 5. For reference, the same markers are overplotted on the third temperature difference and line-of-sight velocity maps (i.e. around log τ₅₀₀ = −3.1), albeit in black for better visibility.