Stellar surface density for the star-forming molecular cloud and the most massive star cluster it formed for a cluster assuming SFE = 100% (left panel), and SFE = 33% (right panel) at the age of 125 Myr. We plot only the stars whose velocities differ less than by 3 km s⁻¹ from the star cluster. In the vicinity of the cluster (r ≲ 100 pc), which is represented by the black dot, the stars formed within a cloud are almost uniformly distributed while the stars released in the tidal tail are elongated approximately along the y-axis. The colourscale and contours have the same meaning as in Fig. 1.