Spectral states of Cyg X-3. Panel a: Radio–X-ray track made by Cyg X-3 as it swings between different spectral states (data from Zdziarski et al. 2016). Panel b: Set of average broadband spectra corresponding to the hard/radio quiescent (blue), intermediate/minor flaring (orange), ultrasoft/radio quenched (black), and soft non-thermal/flaring (magenta) states, as introduced in Szostek et al. (2008). IXPE data are shown with red symbols and the 2σ upper limit at 30 keV (in red) is from Swift/BAT.