(a) Scatter plot between hadronic gamma-ray fraction and N _x for RX J0852. The filled circles and open squares represent the data points where N _p < 3.26 × 10²¹ and <3.26 × 10²¹ cm⁻², respectively. The overlaid solid lines show the relationships derived by the equation aN _p/(aN _p + bN _x) for N _p = 3.26 × 10²¹ cm⁻². The red, orange, and blue lines show the shell, intermediate, and inner parts of the SNR, respectively (the a and b values for each part are in Table 3). (b) Distributions of hadronic gamma-ray fraction overlaid with gamma-ray contours (identical to those in Figure 1).