Euclid S/N maps at detection limit in equi-rectangular celestial projection (same referential as Fig. 17). Top: VIS I_E band S/N; the entire RoI is within specifications (S/N ≥ 10, the first level of light green). Middle: NISP S/N for the J_E band (the Y_E and H_E bands are similar; see Table 7 for overall statistics). Bottom: NISP RG_E band S/N. The more convoluted isocontours of the I_E S/N are caused by the stronger dust extinction versus the NIR. Greyed regions outside the RoI are excluded due to extreme reddening, high stellar density, and/or high zodiacal background (cf. RoI definition and Fig. 17).