... fit

The diffuse gamma-ray continuum emission around ⁶⁰Fe line energies in the inner Galaxy is $\sim$2 $\times$ $10^{-6}~{\rm ph~cm^{-2}~s^{-1}~rad^{-1}~keV^{-1}}$ from COMPTEL measurements (Strong et al. 1999), which is well below the error bars of spectral counts in Fig. 5.

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