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Fig. 3

image

Illustration of the technique used to determine the coordinate transformation matrix (Jacobian) and using it to transform the magnetic field vectors. The model uses the values from the NE2001 thermal electron density model (both local to the SNR and elsewhere along the line of sight). The technique assumes that the initial thermal electron mass density is constant locally around the SNR, which is approximately true for the NE2001 model.

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