Although the model under study is a nonlinear system of ODEs, whose stiffness may vary over time , SAS is based on "interval solutions of the linearized model" whose form is independent of them. Therefore, if for a given SR (say SR ? ) it is possible to integrate the model equations keeping 𝐾 and ℎ $ constant -i.e., the linear problem -, then, the integration of the nonlinear problem can be guaranteed as long as SR(𝜏) < SR ? for (0 ≤ 𝜏 ≤ 𝜏 l ). Therefore, to evaluate SAS with respect to system stiffness, the SR is varied over several orders of magnitude and the performance of SAS is compared with that of the fixedstep ODE integrators from Section 6.1 and with two implicit variable-step methods from MATLAB (MATLAB R2024b, The MathWorks, Inc.): ODE23s and ODE15s, which are specific to stiff problems.