Left panel: NGC 4666 C-band RM map, rotated by 50° on sky, with a beam of 7.2″ × 7.2″. The rectangle boxes of 7″ × 14″ were used for averaging. The orange cross marks the center. Right panel: RM values from boxes along the major axis for both sides of the galaxy. The sinusoidal fit was made for the different sides separately indicated by the color. The sinusoidal fit for the receding side excludes the data point at 38.5″ in Fit 1 and includes this data point in Fit 2.
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