A 1′  ×  1′ map of the equivalent width (EW, unit Å) of the residual interstellar NaI absorption lines. North is up, east is to the left, and the MUSE pixel scale is 0.2″. In contrast to Figs. 1 and 3, we want to show the largest area possible. The EWs refer to the sum of both lines of the doublet. Structures in the cold, atomic gas are not visible, except the central dust lane that appears as a shadow. The lowest EWs are already about 0.5 Å, so we expect more cold gas outside the MUSE field. The gas probably has cooled down from the hot X-ray gas.