(a–c) Time elapsed between the first injection and mush convergence as a function of intrusion growth rate and emplacement depth. Spacing between intrusions is 0.5 km (a), 1 km (b) and 2 km (c). For an intrusion spacing of 2 km, convergence is obtained only for intrusions growing from 12 to 17 km. For spacing of 0.5 and 1 km, coalescence occurs during the intrusion growth, whereas for a spacing of 2 km, it occurs after the last magma injection. (d–f) Maximum melt fraction mid-way between intrusions as a function of intrusion growth rate and emplacement depth. Spacing between intrusions is 0.5 km (d), 1 km (e) and 2 km (f). For an intrusion spacing of 2 km, melt is present only for intrusions growing from 12 to 17 km. (Online version in colour.)