Fit: line + power law + line
Free parameters: 2x boundary points between lines
Algorithm: Nelder-Mead, *20* iterations.

Attach 1: rise times for H>20. Main peak is now double.
Attach 2: heights. Second rise time peak corresponds to four peaks at alpha energies. physical origin unclear.
Overfitting?
Attach 3: comparison between waves of two rise time peaks