Example of the computed scene for a short time range. Top panel: scene and transits for a small stretch of data (≈ 12 seconds or ≈4.5 arcmin AL and ≈1 arcmin AC). Bottom panel: zoom-in of a small group of scene objects and transits around two sources of magnitude close to 13. In both panels, the colour coding of the rectangular symbols representing the actual observations is by residual background flux measured in e⁻ s⁻¹ sample⁻¹. The sources in the scene are represented by filled circles with size and colour proportional to their magnitude. The colour bar in the plot refers to the colour coding used for the observations (see the text for more details).