Likelihood ratio of different sky maps relative to likelihood of a background-only fit (see Eq. (4)). This is obtained by fitting INTEGRAL data in the energy band 1805 keV–1813 keV for the inner Galaxy (solid lines) and the full sky (dashed lines). The simulated sky models (green) correspond to 36 observer positions in the simulation by Fujimoto et al. (2018). Values of TS for the COMPTEL (Plüschke et al. 2001) and SPI (Bouchet et al. 2015) maximum entropy maps are given as observation-based reference points. TS values for the COMPTEL and SPI map differ only by 2 (full sky) and 7 (inner galaxy) and overlap in the figure; therefore they are shown combined in single lines (blue/purple). Higher values of TS indicate a lower probability of occurrence by chance in our set of 13.5 years of SPI data (cf. Appendix A).
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