This article has an erratum: [https://doi.org/10.1051/0004-6361/201425540e]
Comparison between the range of the observed spectra on the disk for 2008–2009 (between black curves) and the predicted spectra, assuming two coronal layers with TH = 615 kK and 1.5 MK, and with Te = 615 kK elsewhere in the corona (blue curves). The continuous line corresponds to h3 = 20 Mm and h2 = 10 Mm, the dotted line to h3 = 10 Mm and h2 = 28 Mm and Mm, and dashed line to h3 = 28 Mm and h2 = 1.7 Mm.
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