Exposure maps for the three targets with three-month observations in Galactic coordinates. The exposures for ⁴⁴Ti, ²⁶Al, and 0.511 MeV are shown from top to bottom. The values represent the effective area integrated over both the observation time and the solid angle of each pixel. The solid angle per pixel is 4.1 × 10⁻³ sr, and the number of pixels is 3072. The range of the color bar is different in each case. It should be noted that the color bars of the images shown in this paper are in the log scale.