Function broaden_with_derivative 

pub fn broaden_with_derivative(
    energies: &[f64],
    data: &ResonanceData,
    temperature_k: f64,
) -> Result<(Vec<f64>, Vec<f64>), DopplerError>

Tier-1 total cross-section and its exact temperature derivative (barn/K), both converged on the same panels.

Errors

As broaden_with_budget.