In contrast to Lange et al., we refrain from a global optimisation algorithm and instead propose another simultaneous fitting procedure of IMQ and IDQ data. We decided to minimise the summed normalised root-mean-squared error (nRMSE) of both functions using a self-written MatLab 2018b script, where the total RMSE was minimised using the MatLab fmincon algorithm for constrained, non-linear optimisation procedures. We follow a grid-search based procedure that replaces the global optimisation procedure by Lange et al. :