To locate the scientific bundles at the center field, move the SP using (ISPFC [sb1,sb2,sb3] [obs]).
There are small off-sets between the rotator center and the positions of the central fibres. If high spatial consistency is required individual apertures can be defined for each bundle. If it proves necessary to re-determine the offsets for any particular bundle(s) software is available for quick image reconstruction (see Section 5.8). In this case, to save time, make sure the autoguider is setup and the chip readout speed is set to turbo.