Midpoint between components, φmid = 0.5(φc1 + φc2) versus ν-2 for one LBA B-mode observation, which was folded with some trial DM value. The midpoint closely follows ~ ν-2 down to 25 MHz and that allows one to determine the correction to the trial DM. The extra lag at the lowest frequency of 24.5 MHz can be explained by scattering delay.
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