It'd be useful to have an optional Smode calibration in which the gamma-ray range is calibrated with its own linear function, using 2 or more lines (similar to Xmode).
the option is already there but how to deal with the multiple lines is TBD, see spectra._do_something_to_deal_with_the_fact_that_you_may_have_many_gamma_lines() 😛
It'd be useful to have an optional Smode calibration in which the gamma-ray range is calibrated with its own linear function, using 2 or more lines (similar to Xmode).