Growth rate of the RTI from the linear theory according to Díaz et al. (2014) as a function of the wave number of the perturbation along the discontinuity. The parameters of the atmosphere assumed for the linear calculation are those from Table 1; the magnetic field is inclined with respect to k by θ = 89° (dashed line) and by θ = 90° (dotted line). Solid line shows the case of θ = 89° with the ambipolar diffusion term taken into account.