Extended Data Fig. 1: Variation with time of flux and polarization for the IXPE Main observation.
From: Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE
(A) The total rate in the 2–8 keV energy range, binned in time intervals of 500 s. The PD (B) and the PA (C) are averaged over one orbit, as defined by the ephemeris of21. Dashed horizontal lines are the average values. (D) The hardness ratio defined as the ratio of the difference in the IXPE count rates in the 4–8 and 2–4 keV energy bands to their sum in 1000 s time bins. Alternating vertical bands identify different orbits. Data are presented as mean values over the time bin and the error bars correspond to 1σ confidence levels.