Fig. 1.
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Position and orientation of the MOS slit superimposed on the Centaurus A galaxy dark lane seen in the R band. The 2″-wide slit is formed by positioning two opposite MOS blades (shown in blue). It is centered on the polarized knot (indicated by a square). The scale and orientation of the field are indicated. The green disk is the FORS Instrument Mask Simulator (FIMS) control button.
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