Torque acting on the planet over time normalised by Γ₀. We smooth over four orbits with a Gaussian window and compare it to the simulation of D’Angelo & Lubow (2010, red dashed line). In the legend we give the total torque averaged over the last 50 orbits. Owing to the turbulence in the VSI disc the torque strongly fluctuates, while for the α-disc the evolution is much smoother. The oscillations in the last panel for the 100 M_⊕ planet are due to the presence of a vortex.