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Fig. A.1.

Fig. A.1. Refer to the following caption and surrounding text.

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Upper panel: 5° ×5° map of polarised intensity observed from FAST at the centered wavelength of 23 cm for the Cygnus Loop region (Sun et al. 2022). Lower panel: Map of the observed polarised intensity for 4.2° ×4.8° extent for the loop region from the Urumqi-25m telescope at 6 cm wavelength from Sun et al. (2006).

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