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Table 1

Spatial models tested for the GeV γ-ray emission above 2 GeV (SrcX subtracted).

Morphology(>2GeV) TS TSext Best–fit extension(º) σ(º) Ndf(a) ΔAIC (b)
Model 1 (single point) 81 4 0
Model 2 (two point) 147 8 −62
Model 3 (multiple point) 296 28 −167
Model 4 (disk) 623 542 R68=1.255±0.03 σ=1.530±0.04 5 −540
Model 5 (Gaussian) 644 563 R68= 1.377±0.05 σ=0.912±0.03 5 −561
Model 6 (ring template)(c) 359 278 Rin(out)=0.15º(1.53º) 6 −274
Model 7 (Urumqi λ6cm map) 351 270 2 −274
Model 8 (two half-lobe horizon) 652 571 7 −565
Model 9 (two half-lobe +30°) 651 570 7 −564
Model 10 (two half-lobe −30°) 649 568 7 −562
Model 11 (H2 map 1)(d) 658 577 7 −571
Model 12 (H2 map 2)(e) 657 576 7 −570

Notes. (a)Degrees of freedom. (b)Calculated with respect to model 1. (c)Best-fit ring inner radius in steps of 0.05°. (d)Gas velocity interval in [−9.8,+2.4] km s−1. (e)Gas velocity interval in [−9.8,−3.8] km s−1.

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