H₂ υ = 0–0 S(0) to S(7) pre-processed maps obtained with Spitɀer/IRS toward the region IC443G. The S(1) to S(7) maps were convolved to the spatial resolution of the S(0) map (8″.3, see Sect. 4.2). The S(0) line was mapped by the LH module, the S(1) and S(2) lines were mapped by the SH modules, and the rest were mapped by the SL module. The S(2) line was mapped by both the SH (top row) and SL (second row) modules. The coordinates of the field of observations are indicated in Fig. 2. Raw maps are shown in Fig. A.1. The array of white circles indicates the positions in which we extracted the signals of the S(0) to S(7) spectral-line maps to produce the population diagram mosaics presented in Fig. 5 (model 1: standard LTE approach) and Fig. 9 (model 2: H₂ thermal admixture model). The size of the circles corresponds to the angular resolution of the S(0) observations, that is, 8″.3 in diameter.