Comparison between the observed (crosses) and simulated (lines) cumulative distributions of the peak-to-peak RV amplitudes (top row) and of the variability time scales (bottom row). In the left- (resp. right-) hand panels, we vary the exponent π of the period distribution (resp. κ of the mass-ratio distribution) by ±1σ. The upper-left legends indicate the values of π, κ and η considered in each panel. The bottom-right legends give the overall VFTS detection probability for the adopted parent distributions.