GLIMPSE false colour (blue = IRAC I1, green = IRAC I3, red = IRAC I4) image for Masgomas-6. The extension ofthe cluster candidate derived from the automatic search algorithm is shown (solid blue circle). The areas used for decontamination are also shown: cluster field (dashed white circle) and control field (dashed green circle). We markedthe stars spectrally classified as early-type (dwarf, giant, or supergiant) and the evolved massive stars (Wolf−Rayets) with small green boxes, the late-type giants with red circles, the star without classification (star 14) with a black square. The length of the orientation arrows is 1.0 arcmin.