TS maps in the vicinity of SNR G150.3+4.5 observed with the Fermi-LAT. All figures are generated with square bins of 0.02°. The energy ranges are indicated above the panels. The green circle represents the best-fit 2D Gaussian template from Devin et al. (2020). The white solid and dashed circles show the R₆₈ and radius of the uniform disk model in this work, which is separated by the white horizontal line into two half-spheres: northlobe and southlobe (models 8 & 11 & 12). The white dashed line corresponds to the +30° and −30° scenarios (models 9 and 10). The unnamed white cross in the upper right corner represents a background point source from 4FGL-DR3 (Abdollahi et al. 2020, 2022) and SrcX represents the point source 4FGL J0426.5+5434, which has been treated as a distinct background point source. The cyan contours are extracted from Urumqi λ6 cm results (Gao & Han 2014), showing the complete shell structure. The red and orange circles are R₃₉(σ) size for the LHAASO KM2A and WCDA sources (Cao et al. 2024), respectively.