Zoom of the central region from Fig. 1. The color contours represent the stellar surface density (number of COUP sources using a cell box of 0.03 pc × 0.03 pc, right color scale) for the three extinction ranges (log N_H < 22.0 cm^-2 in the left panel; 22.0 cm^-2 < log N_H < 22.5 cm^-2 in the middle panel; and log N_H > 22.5 cm^-2 in the right panel). The color contours have been smoothed for display purposes. As in Fig. 1, the dashed contours represent the CN emission, and the four crosses, the open square, and the open triangle show the location of the four main-sequence massive Trapezium stars, the OHC, and the OMC1-S.