Imaging the positron annihilation line with 20 years of INTEGRAL/SPI observations

Open Access

Fig. D.1

Distribution of normalized residuals $(D_{p, d, e} - ϵ_{p, d, e}) / \sqrt{ϵ_{p, d, e}}$ $\[\left.(D_{p, d, e}-\epsilon_{p, d, e}\right) / \sqrt{\epsilon_{p, d, e}}\]$ , where D_p,d,e is the observed count and ϵ_p,d,e is the expected count from the reconstructed image and background normalization. The solid red line shows a standard normal distribution for comparison.

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