The calculators provide identical functionalities, but rely on different methods. The first calculator (`DEsp`) integrates the stopping powers numerically, whereas the second and the third calculator (`DEr1` and `DEr2`) use the inverse-range method, though they differ in the way they determine the range function.
If you do not have [GSL](wikis/GSL) installed on your computer, you can still use our home-made integrator:
If you do not have [GSL](GSL) installed on your computer, you can still use our home-made integrator: