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Using the Supernova Remnants (SNR) hypothesis for the radio loops, distances   of the Origem and the Monoceros loops were calculated from the surface   brightness and the angular diameters at 1420 MHz. The data were taken from   the northen sky radio continuum survey at 1420 MHz (Reich and Reich, 1986)   while the surface brightness-diameter (Σ − D) relation for SNR was taken from   Berkhuijsen (1973). The distances of two loops determined here are larger   than earlier ones, have radio astronomical roots and smaller relative errors

Distances to the Origem and the Monoceros loops