Mock UV (HST F275W filter) surface brightness map for W0 at 70 Myr (projection). The upper limit of the surface brightness (colour bar) is the observed HST 5σ magnitude limit below which we cannot detect the light (Gullieuszik et al. 2023). Embedded are three zoomed-in (by three times) regions on the map. In this snapshot, the initial ram pressure wave has just passed the galaxy and rapidly stripped a significant portion of gas, which then immediately started to form stars. The pre-RPS stellar population is also visible as a smooth thin disc.