Multiwavelength results on Cyg X-1. Panels (a) and (b): PD and PA of polarization in X-rays (IXPE), optical (DIPol) and radio (VLA). Panel (c): light curve in the radio as measured with AMI, VLA and RATAN 600. Panel (d): MAXI photon flux in 2–20 keV. Panel (e): MAXI hardness. In panels (d) and (e), we show all MAXI data in gray, highlighting in color only the data obtained simultaneously with IXPE. MJD₀ = 59653 (2022 March 15).