Surface imaginary part of the potential perturbation for the ℓ = 2, m = 2, n = 25, k = −5 oscillation mode on the left, and for the ℓ = 2, m = 2, n = 11, k = −5 oscillation mode on the right. The orange curves correspond to the results of the coupled oscillation code, while the blue curves correspond to the solution from the uncoupled oscillation code. The dark curves correspond to negative values of the potential perturbation, while the lighter curves correspond to positive values.