Fig. 8
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Pre-fit and post-fit residuals after fitting for DM shown in relation to frequency. The figures show the same orbital phase (ψ ~ 130°) in a circular orbit but for different pulse profiles. (a) J0737–3039A profile (see Fig. 6), residuals can mostly be absorbed by fitting DM. (b) Narrow Gaussian profile (see Fig. 7), only residuals ≳660 MHz are absorbed by fitting for the DM.
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