The mean and the most probable stopping cross-section for 50- to 150-: eV sodium and 50- to 300-keV argon projectiles in carbon have been measured as functions of the foil thickness. The results are interpreted on the basis of results from a recent simulation study by Skoog. The various methods for separating the experimental stopping cross-section into an elastic and an electronic part are discussed. Both stopping cross-sections have been deduced from the experimental results.