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Fiducial markers: offline

Succesfull reduction of systematic error!

Without applying a correction protocol, the

systematic errors (

Σ)

are:

4.8, 2.2 and 2.9 mm in the vertical, lateral and

longitudinal directions

The SAL protocol

0.7, 0.8 and 0.8 mm, respectively.

Random position variations are not reduced in

an off-line correction protocol