Notes. There is an overlap at each side of the regions. The total number of photons, the solid angle of the region for a single hemisphere, and the mean angular separation lengths for the north and south Galactic regions are given; the clearly evident N–S asymmetry is mainly due to the different exposures. In the last three columns we report the number of clusters found in each region with the primary selection and after the application of the secondary standard and weak selections, as described in the text. The Galactic longitude intervals are A: 0° < l < 182°, B: 178° < l < 362°, C: 0° < l < 41°, D: 39° < l < 182°, E: 178° < l < 331°, and F: 329° < l < 362°.