4.5, 5.8 and 8.0  IRAC filters, of the whole survey. By inspecting some specific regions with this viewer, we noticed that some heavily ECs are still missing in the @Mercer2005 list. An EC consists mostly of YSOs, which are intrinsically redder than field stars due to thermal emission from circumstellar dust, so that they are distinguished from background/foreground stars mainly by their red colors. Such a cluster would therefore produce a clearer spatial overdensity of stars in a point source catalog previously filtered by a red-color criterion, and would be more likely missed in a search of overdensities considering the totality of point sources, due the high number of field stars. We believe that this is the principal reason which would explain the incompleteness of the @Mercer2005 catalog.

We then implemented a very simple automated algorithm using the GLIMPSE point source catalog to find the locations of EC candidates. First, we selected all point sources satisfying a red-color criterion: $[4.5] - [8.0] \ge 1$, following @Robitaille2008, who applied this condition to create their catalog of GLIMPSE intrinsically red sources. As already explained in that work, the use of these specific IRAC bands is supported by the fact that the interstellar 