Fig. 3.

Energy spectrum of $\mathit{\beta }\mathit{\beta }$ decay candidates in enriched ${}^{82}$Se (data points) and the best-fit model from the binned extended maximum likelihood analysis (solid blue line). The red arrows point at the three best fit Gaussian functions for the three regions of interest: a for ${}^{82}\mathrm{Se}{\to }^{82}{\mathrm{Kr}}_{0_1^{+}}$, c ${}^{82}\mathrm{Se}{\to }^{82}{\mathrm{Kr}}_{2_1^{+}}$ and d for ${}^{82}\mathrm{Se}{\to }^{82}{\mathrm{Kr}}_{2_2^{+}}$