This is data we've inherited from the Brazilian icranet via Carlos
Brandt.

We got the original RD and data from https://github.com/cbdc/magic; I've
pimped it to return SDM and make the FITSes available through datalink.

The test data is MAGIC_2015_CrabNebula_SPECTRUM_1.fits and
MAGIC_2006_HESS1813_SPECTRUM.fits.