Sky constraints as experienced by Euclid from L2, and the RoI avoiding the worst regions. The four quadrants of the RoI are in blue. The solid yellow lines trace the ecliptic latitude threshold of |β| = 10°. The solid red lines trace the galactic latitude threshold of |b| = 23°. For declination δ ≥ +30°, the threshold is |b| = 25° to match the northern ground surveys (Sect. 5.2.1).