Colour–colour diagram, [3.6]−[4.5] versus [5.8]−[8.0], for all Spitzer-GLIMPSE sources with measurements in the four bands, situated at less than 7′ from the exciting star (#1) of G010.32−00.15. The big red dots correspond to sources with measurements more accurate than 0.15 mag in all four bands, the small red dots for the less accurate sources. See Fig. 9 for further information.