$2\stackrel{°}{.}0\times 2\stackrel{°}{.}0$Fermi-LAT residual count maps above 1 GeV (in units of counts per pixel), from the location of the SNR G309.8+00.0, applying different modeling to the γ-ray emission from the 4FGL J1349.5−6206c source. All sky maps, of 90″ pixel size, centered at the best-fit coordinates of the 4FGL J1349.5−6206c source have been smoothed with a 6.5σ Gaussian kernel. Left panel: residual map obtained by modeling the 4FGL J1349.5−6206c as four point-like sources. Middle panel: residual map obtained by modeling the 4FGL J1349.5−6206c as a single source according to the 4FGL-DR4 catalog model. Right panel: residual map obtained by excluding from the model the 4FGL J1349.5−6206c source. The yellow and black contours mark the position of nearby CO clouds as obtained from the CO Galactic plane map (Dame et al. 2001). In all panels, the cyan contour marks the SNR G309.8+00.0 extension as seen in SUMSS 843 MHz radio data. The green, white, red, and magenta dashed circles (centered on the maximum TS values and with radius obtained setting a lower TS cut of 2σ, > 5 GeV) provide the locations of the 4 components (src, src-north, src-west, and src-southwest, respectively) that the 4FGL J1349.5−6206c source can be decomposed to. The yellow circle represents the 68% containment size of the PSF at the energy threshold of each sky map, with no smoothing applied. The latter PSF size applies to all three panels, however, since it appears that the instrument’s PSF cannot resolve individual components of the 4FGL J1349.5−6206c source at ∼1 GeV, we only present it on the left-hand panel to avoid overcrowding.