Sky distribution of the average number of CCD transits per HEALPix pixel (at level 5, about 3.36 square degrees per pixel) for window-class 1 observations (1D, long windows, stars with estimated brightness between 13 and 16 mag). Approximately 8 to 9 CCD transits correspond to one field-of-view transit. Positions in the sky are given in equatorial coordinates using a Hammer-Aitoff equal-area projection. The large number of transits near the ecliptic poles are due to the special scanning mode used during the first 4 weeks of the mission.