RMs from the RM cube of the combined λ18 cm and λ22 cm data above a 5σ detection limit. The polarised instrumental signal at the centre of the galaxy was blanked. In the lower left we show the size of the synthesised beam (43.̋1 × 39.̋6). The Galactic foreground RM of −19.65 rad m-2 was corrected for. The red cross marks the optical centre of the galaxy.
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