Extended Data Fig. 4: PA evolution summary statistics of FRB 20221022A versus the CHIME/FRB Baseband Catalog 1 (BaseCat1) polarized sample4.
From: A pulsar-like polarization angle swing from a nearby fast radio burst
a, A histogram of the reduced chi-square statistic measuring the PA curve variability, \({\chi }_{\nu }^{2}\). b, A measure of the degree of symmetry of the PA curve of FRB 20221022A relative to equivalent measurements determined for a subset of the BaseCat1 sample. The red vertical line represents a significance of p-value = 0.01 and the displayed p-values have been Bonferroni corrected by for the number of trials per event (see text for details). FRB 20221022A is a clear outlier both in terms of its maximum PA excursions (a) and its high degree of symmetry (b) relative to the BaseCat1 sample.
