Projections along Galactic longitude (left-hand panel) and Galactic latitude (right-hand panel) of the acceptance-corrected γ-ray excess map and the best-fitting function (solid line). The latitude and longitude ranges used for the projections correspond to the respective fit ranges and are indicated by the shaded regions. The 68 per cent containment region of the PSF of the H.E.S.S. instrument is shown by the dashed–dotted lines. The fitted contribution of the diffuse γ-ray emission is indicated by the dashed curve. The dotted lines in the latitude projection depict the extension of the best-fitting function beyond the latitude coverage of the CS line emission survey used for the diffuse γ-ray background model. Possible features in the γ-ray excess outside of the fit boundaries are under study, but do not affect the position determination.