Rotation diagram for the glycolaldehyde transitions reported in Table 2 for NGC 1333-IRAS2A (upper-left panel), NGC 1333-IRAS4A2 (upper-right panel), NGC 1333-IRAS4B1 (lower-left panel), and NGC 133-SVS13A (lower-right panel). The line intensities have been corrected for beam dilution using the sizes derived in Sect. 4.1. The parameters Nup, gup, and Eup are respectively the column density, the degeneracy, and the energy of the upper level. The error bars on ln(Nup/gup) are given by the vertical bar of the symbols. Red and blue points refer to the lines detected in the 1.3 mm and 1.4 mm spectral bands, respectively. The dashed lines represent the best fits.
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