Left: evolution of the maximum of |σ − σ_o| as a function of time normalized by the corotation time for four different spins, showing how an increased spin causes a higher saturation (it is a logscale in y and the saturation varies by more than a factor of two). The cases represented here are, from right to left, blue circle a = 0.995 at r_c = 2.7r_g, purple square a = 0.98 and r_c = 3.24r_g, black diamond a = 0.9 with r_c = 4.65r_g and green triangle a = 0.5 at r_c = 8.5r_g. Right: saturation levels reached by RWI in our simulation sample with corotation radius and spin parameter ranging from r_c = 14r_g to r_c = 2.7r_g and from a = 0 to a = 0.995. All simulations have the same set of parameters regarding the unstable zone, namely the same ε and δ. It clearly appears that the saturation level increases as the corotation radius is decreasing meaning that higher spin will lead to the RWI occurring nearer to the black hole, which then leads to enhanced saturation levels in the instability.