Table 1.

Linac central axis projected on EPID. X and Y refer to cross‐ and in‐plane distance, respectively.

Gantry Angle	X Center Distance (cm)	Y Center Distance (cm)	X Distance From Ave (cm)	Y Distance From Ave (cm)
180	13.06	13.37	0.005	0.103
90	13.06	13.27	0.005	0.003
270	13.04	13.27	$-0.015$	0.003
0	13.06	13.16	0.005	$-0.107$