Fig. B1
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4FGL source number distribution in galactic latitude (b) shown in the top-left panel. Bottom left panel: 4FGL source number distribution in galactic longitude for |b| < 5°. Right panel: Cumulative numbers of sources and the threshold fluxes for LAT 4FGL sources (histograms) with the power-law fitting results of their high-flux trends (red dashed line). The grey dotted line represents for the 95% upper limit obtained from flux analysis in Sect. 2.3.
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