Modell star formation temporal evolution in 2 × 2 kpc² square regions centered at increasing radii from left to right and top to bottom, spanning radii from 2.25 kpc to 5.25 kpc. The squares of the leading and trailing sides of the bar, shown in Fig. 1, are merged into one square per edge of the bar centered on (x, y) = (±R, 0), light blue and orange indicating the left and right side, respectively. The upper and lower edges of the bar minor axis are differentiated, using black and gray, respectively. The regions at the bar ends show i) lots of fluctuations, ii) more star formation than along the bar minor axis until just outside the bar radius.