Table 1: 511 $\rm {keV}$ line fit parameters for VDMs before and after final setting.
  Initial settings After tuning
VDM Peak $\sigma$ FWHM Peak $\sigma$ FWHM
  (chan) (chan) (%) (chan) (chan) (%)
1 50.7 4.66 21.7 25.8 2.9 26.6
2 50.3 6.7 31.3 26.6 3.3 29.4
3 53.5 5.3 23.4 27.7 4.0 34.4
4 50.8 5.2 24.2 26.7 3.2 28.5
5 50.7 6.3 29.2 25.6 3.2 30.2
6 46.3 6.1 31.3 25.2 3.5 32.9
7 47.5 7.1 35.0 26.4 4.9 43.4
8 51.7 6.5 29.8 26.7 3.3 28.6
9 51.7 4.4 20.1 26.5 2.7 24.8
10 49.0 4.7 22.6 26.0 2.9 26.6
11 - - - 27.4 4.0 35.0
12 55.9 5.5 23.2 25.8 3.4 31.0
13 49.9 4.5 21.1 26.4 2.8 25.2
14 53.6 5.9 25.9 24.4 2.7 22.8
15 50.6 5.5 25.4 25.0 3.4 31.7
16 50.5 4.9 23.1 26.6 2.9 25.4
Total 50.9 5.8 26.5 26.3 2.9 25.9


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