Masgomas-4 K_S image obtained with LIRIS. Stars with spectral classification are marked with blue (OB-type dwarfs), green (A, F, and G dwarfs), and red squares (giant stars). We also mark with yellow rhombi the Herbig Ae/Be candidates and with red crosses the position of the IRAS sources. Orientation is the same as in Fig. 1 to help comparison between the figures. Length of orientation arrows is 1 arcmin, and black squares show the orientation of both multi-object masks (regions A and B).