Left: smoothed NSB rate per camera pixel in MHz for CT5 overlaid with contours for 3.5, 4.75 and 6σ of the mono analysis of DS-I and DS-II. Turned-off pixels are treated as 0 MHz, hence the map illustrates the average NSB operating pixels are exposed to. The optical position of η Car is denoted with a small star. Right: zoom into the 2D γ-ray acceptance map (top) and the relative asymmetry in RA and Dec (bottom).