G'Day Alex;
The guys in this paper say they've measured heaps of pulsars & their fields ..
Quote:
RMs for ~ (1–5) x 10∧8 polarized extragalactic sources, spaced by only ~ 30"–50" on the sky! plus:
RMs of several 1000 Galactic pulsars and several 100 pulsars in nearby galaxies
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Cheers