Maps of the pressure-based relative SFR of GalA (left) and GalB (right) and indicated by colour maps. Top: contours of the Hα emission at 3 × 10^-16ergs^-1cm^-2 and from 5 to 20 × 10^-16ergs^-1cm^-2 in steps of 5 × 10^-16ergs^-1cm^-2 for GalA and at 5, 10, and 15 × 10^-16ergs^-1cm^-2 for GalB over-plotted. Bottom: contours of the NUV emission from GALEX over-plotted on the same pressure-based SFR colour maps as in the top panels. The optical data cubes are aligned using the DSS observations and are therefore correct to ~1–2″.