Fig. 4

Zoom into the MEG spectrum at the energy of the Mg xi and Si xiii triplets with the 4096 channels binning (i.e., at HWHM of the spectral resolution). The blue labels indicate the expected position of the forbidden, intercombination, and resonance transitions. The top panel shows the Mg xi region. While there is no evidence of emission at the energy of the forbidden component, the finer binning confirms both the strength and broadening of the resonance emission line. The lower panel shows the Si xiii triplet, where the finer binning confirms both the strength and broadening of the forbidden and resonance emission lines. While it is not statistically required (ΔC = 2) we also included a Gaussian emission line to account for a possible intercombination component.
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