Correlation for the simulations described in Table 2. Upper panel: cloud collision rate of the simulated quiet galaxies before collision as a function of the theoretical cloud collision rate based on Eq. (3). Middle panel: maximum collision rate in bins of 10 Myr as a function of the cloud particle mass-size relation ξ. Lower panel: total gas mass in the bridge region as a function of the maximum collision rate. Crosses: i = 0°; diamonds: i = 30°; triangles: i = 45°.