Examples of the different types of SEDs found in the Gaia sample. The photometry we used is listed in the insets of the panels, and the solid line connects the data points to guide the eye. From left to right and from top to bottom: Single-peaked SED, double-peaked SED, flat SED, and peculiar SED. According to the literature, the plotted sources are an OH/IR star, a post-AGB star, another OH/IR star, and a YSO, respectively. An SED graph for any source in the final catalogue can be retrieved through the online service (see Appendix A).