The yellow histogram shows the convolution of the distribution of ejected MS stars more massive than 15 M_⊙ (red histogram, cf. Fig. 5) with a Gaussian with full-width-half-maximum of 10 km s⁻¹ representing (an upper limit to) the velocity dispersion of a star forming region (shown in the inset plot). In this figure, the red histogram is normalized so that its surface area is one.