Mass-weighted age map of the stellar populations in AM0644-741 derived from the MUSE data using the GIST pipeline. The left panel shows the age map of the same region as displayed in Figure 3, estimated with a regularization error (RE) of 0.15. The solid red line on the right panel shows the average age values plotted along the pseudo slit as shown on the left panel. The shaded red region around the solid line highlights 1σ deviation on the age values estimated considering four different RE values (i.e., RE = 0.10, 0.15, 0.30, 0.45).