for supernova remnants (SNRs) in our Galaxy. We also present new theoretical derivations
of the Σ–D relation based on equipartition or on a constant ratio between cosmic rays and
magnetic field energy. A new calibration sample of 60 Galactic SNRs with independently
determined distances is created. Instead of (standard) vertical regression, used in previous
papers, different fitting procedures are applied to the calibration sample in the log Σ–log D …