Fix: use sigma instead of FWHM in compute_gaussian_srf#10
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scipy.stats.norm(loc, scale) expects scale = 1-sigma, not FWHM. FWHM = 2*sqrt(2*ln2)*sigma, so passing fwhm directly made the resulting SRF too wide. Fixes GFZ#9
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Fixes #9
scipy.stats.norm(loc, scale) expects scale = 1-sigma, not FWHM. This PR
converts FWHM to sigma before constructing the Gaussian:
See linked issue for derivation and reproduction.