Hot dust temperature Tsingle derived from the single-epoch decomposition, where T is a free parameter in each epoch, versus the temperature Tmulti from the multiepoch fits, in which T evolves according to Eq. (4) and only the initial temperature T0 is a free parameter. For epochs 1–9, the temperature resulting from the epoch 1–9 fit is plotted, for epochs 10–29 the temperature from the epoch 7–29 fit. The minimum that is seen in Tsingle around MJD 56 700 (and also in the corresponding JHK flux minima) is not covered within the sampling of the z-band data (see Figs. 8 and 2), therefore we observe a substantial discrepancy between Tsingle and Tmulti around that date.
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