The random and systematic errors , respectively , of the prostate bed motion in the anterior-posterior , superior-inferior and left-right planes , respectively , were as follows : upper portion , 0.47 cm and 0.50 cm , 0.28 cm and 0.27 cm , 0.11 cm and 0.11 cm ; lower portion , 0.17 cm and 0.18 cm , 0.17 cm and 0.19 cm , 0.08 cm and 0.10 cm .