Masgomas-4 false colour image (J = blue, K_S = green, 5.8 μm = red). J and K_S images are from LIRIS, and the 5.8 μm image is from IRAC, Spitzer. The size of Spitzer image is 12′ × 7′, and the size of the false colour image is 9.2′ × 5.2′. White crosses show the central positions of the IRAS sources and blue crosses show the position of the masers (water, ammonia, and methanol) reported in Sect. 1. The variable object V 1665 Aql is marked with a white circle. The arrows indicate the image orientation and are 1 arcmin in length. White squares show the orientation of both multi-object masks (masks A and B).