Function bragg_stopping_power 

pub fn bragg_stopping_power(
    model: &dyn ElectronicStopping,
    correction: &dyn CompoundCorrection,
    ion: &Ion,
    material: &Material,
    energy_ev: f64,
) -> Result<f64, StoppingError>

Linear stopping power -dE/dx, J/m: N times bragg_cross_section_per_atom.