# Table 3 Mean and standard deviation of the FWHM for the parameter set obtained before and after calibration

Pinhole distance (cm) 1 2 3 4 5
Mean FWHM ± σ FWHMbefore calibration (cm) 52.4 0.854 ± 0.002 0.851 ± 0.003 0.850 ± 0.003 0.859 ± 0.001 0.872 ± 0.001
58.4 0.937 ± 0.003 0.895 ± 0.002 0.932 ± 0.006 0.943 ± 0.01 0.923 ± 0.003
64.4 0.988 ± 0.005 1.005 ± 0.006 0.971 ± 0.004 0.993 ± 0.004 1.022 ± 0.008
70.4 1.065 ± 0.001 1.069 ± 0.008 1.079 ± 0.012 1.083 ± 0.014 1.072 ± 0.016
76.4 1.163 ± 0.005 1.154 ± 0.004 1.187 ± 0.005 1.180 ± 0.006 1.187 ± 0.006
Mean FWHM ± σ FWHMafter calibration (cm) 52.4 0.768 ± 0.027 0.749 ± 0.027 0.785 ± 0.014 0.807 ± 0.019 0.770 ± 0.014
58.4 0.852 ± 0.038 0.821 ± 0.015 0.858 ± 0.013 0.868 ± 0.014 0.875 ± 0.019
64.4 0.933 ± 0.011 0.926 ± 0.026 0.933 ± 0.026 0.953 ± 0.022 0.944 ± 0.027
70.4 1.005 ± 0.030 1.023 ± 0.015 1.018 ± 0.020 1.039 ± 0.011 1.039 ± 0.037
76.4 1.121 ± 0.014 1.115 ± 0.012 1.135 ± 0.024 1.141 ± 0.011 1.138 ± 0.034
$$\begin{array}{l}\left|{\mathrm{FWHM}}_{\mathrm{before}}\right.\\ {}\left.-{\mathrm{FWHM}}_{\mathrm{after}}\right|\\ {}>\\ {}\sqrt[2]{\sigma_{\mathrm{before}}^2+{\sigma}_{\mathrm{after}}^2}\end{array}$$ 52.4 Yes Yes Yes Yes Yes
58.4 Yes Yes Yes Yes Yes
64.4 Yes Yes No No Yes
70.4 Yes Yes Yes Yes No
76.4 Yes Yes Yes Yes No