Category Maximum Error recorded in any direction(in mm) Mean Set-up Error (in mm) Mean Displacement Vector (M)(in mm)
Mediolateral (ML) Craniocaudal (CC) Anterioposterior (AP)
Population 3.87 2.1 1.5 1.16 1.57
VC 2.75 -0.3 -0.4 1.6 1.52
BB 3.87 0.8 1.7 1.5 1.72
Table 2: Maximum, mean set up errors in ML, CC and AP directions and value of mean displacement vector for the population, VC and BB groups.