Extended Data Fig. 4: Polarimetry stability test.
From: Diverse polarization angle swings from a repeating fast radio burst source
a, Temporal stability test. The RM values of PSR J1915+1009 measured with the Bayesian method confirm that there is no obvious RM variation in a one-day interval. The error bars denote 68% confidence intervals. b, Off-axis polarimetry test. PSR J1915+1009 was first placed at the beam centre and then 2.6′ away from the beam centre. The RM values measured with the Bayesian method confirm that there is no apparent systematic error for the off-axis illumination. The off-axis data point has a larger error because S/N drops for those observations owing to the off-axis illumination. c, Polarization pulse profile and PA for PSR J1915+1009, observed with central illumination. d, As in c, but off-axis illumination is used. e, Polarization profile and PA with central illumination observed one day later. f, Polarization pulse profile measured with the Parkes radio telescope by Johnston & Kerr42.
