for both bin sizes. It should be noted that since the red-color criterion produced density maps with low crowding and therefore the local background density is always close to zero, a more sophisticated algorithm is not needed. In fact, the red-source density maps have a mean and a standard deviation of 0.039 and 0.21 sources/bin for the small bin, and 0.13 and 0.43 sources/bin for the large bin, which means that the used thresholds are above the $15\sigma$ level. Again, we emphasize that the automated search was only used to find possible locations of ECs; we did not intend to catch the complete YSO population for a given cluster in this process.

[lrrccrrcl]{}

\
G3CC & $\ell$ & $b$ & $\alpha$ & $\delta$ & Diam. & $N_{\rm circ}$ & Det. & Flags\
& ($\degr$)& ($\degr$)& (J2000) & (J2000) & ($\arcsec$) & & &\
(1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9)\

\
G3CC & $l$ & $b$ & $\alpha$ & $\delta$ & Diam. & $N_{\rm circ}$ & Det. & Flags\
& ($\degr$)& ($\degr$)& (J2000) & (J2000) & ($\arcsec$) & & &\
(1) & (2) & (3) & (4) & (5) & 