Open Access

Fig. 24.

image

Variation (with azimuthal angle in the galaxy plane) of Faraday rotation measures RM between λ6.2 cm and λ3.6 cm at 3′ HPBW, averaged in the radial ring between 9 kpc and 11 kpc, in sectors of 10° width. The black line shows the sinusoidal fit, the red line the combined sinusoidal + double-periodic fit, with reduced χ2 values of 1.3 for both fits.

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