Strange behaviours by plotting a typical PWR spectrum of a pin cell

Dear @Shimwell ,

thanks for your reply. Unfortunately, the spikes come from the division by np.log(ene_group[1:])-np.log(ene_group[:-1]) and not from the square root normalization.
About adding ECCO1968 to the existing collection, I think it’s a good idea.

Thanks for your time.
Best regards,

Christian