Electronic stopping powers of heavy particles in the low-velocity region (below the velocity for the stopping power maximum) have been assumed to be strictly velocity-proportional 1). The theoretical estimates of Lindhard, Scharff and Schiøtt 2) and Firsov 3) have been used, with certain scale adjustments, whenever stopping powers or ranges are required, especially for cases where direct measurements are not available. Recent data suggest that this procedure will cause serious errors in range estimates for heavy ions.