Fig. 5: Modulation of the ionization parameter.
From: The supernova remnant SN 1006 as a Galactic particle accelerator

Azimuthal profile of the ISM ionization parameter derived from Chandra spectra (blue crosses) (see Table 1). Errors are at the 68% confidence level. Angles are measured counterclockwise from the direction of ambient magnetic field. The red curve marks the profile expected for parallel efficiency (ξp = 12%, with ξB = 5% and ξs = 6%), assuming the same \(\overline{{{\Delta }}T}\) for all regions. Source data are provided as a Source Data file.