Decomposition of the O Iλ8446 and Ca IIλλ8498, 8542 complex using the Ca IIλ8662 line profile (see Fig. 10) as a template for each line constituting the blended profile (black solid line; upper panel). We are able to reconstruct the O Iλ8446 and Ca IIλλ8498, 8542 complex using a Ca II triplet ratio of 1:1:1 and an O Iλ8446-to-Ca IIλ8662 ratio of 0.85:1. In order to be able to cleanly reconstruct the slope of the blue wing of O Iλ8446, we have to convolve the Ca IIλ8662 template with a Gaussian with a width corresponding to σ = 70 km s⁻¹. The difference between original blended line profile (black solid line) and reconstructed line profile (black dashed line) is shown in the lower panel.