Distribution of the sSFR surface density (ΣsSFR) for spaxels in each WHAN category for each merger stage (the number of galaxies in each category is indicated in parentheses). The distributions are shown in the form of box plots, with a different colour for each WHAN category as in Fig. 11. The median values of the distributions are represented by a horizontal line within the box plots, while the mean values are represented by a white circle. Outlier values (larger than 1.5× the inter-quartile range) are represented by black diamonds. The distribution for passive galaxies is not presented since the values of the ΣsSFR are null.