Table 2.

Global energy resolution of the system at different steering electrode bias.

	Before calibration	After calibration
Steering electrode bias (V)	FWHM energy resolution (%)
60	$12.74\pm 2.43$	$8.67\pm 1.04$
70	$11.78\pm 2.11$	$7.68\pm 1.06$
80	$11.0\pm 2.04$	$7.43\pm 1.02$
90	$10.94\pm 2.00$	$7.35\pm 1.08$