Top: models at the position of G317.3–00.2 and for a distance of 2 kpc showing the impact of excluding the various magnetic field components. Bottom: corresponding magnetic field vectors shown in the z–y plane (i.e., the plane of the sky, see Appendix A) and cut through the center of the SNR bubble. Left panel: only the disk field, Bdisk has been included. The two limbs are more or less uniform in brightness (slightly brighter in the north). Center panel: toroidal halo field, Btor has been included. There is now some asymmetry introduced since the magnetic field is stronger in the south with the addition of the toroidal halo component. Right panel: the X-field, BX−field, has now been included. The vector sum of these components has now made the field in the northern half of this SNR much smaller in magnitude and the direction has changed (there is now a much stronger line-of-sight (x) component in the northern half, though that is not visible on this figure). Thus the model SNR shows a high degree of asymmetry, which strongly resembles the data.
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