Multiwavelength measurements of the PA of Mrk 501 simultaneous to the new IXPE observations. The IXPE observation times are highlighted in grey and its measurements are represented by the black stars. The jet direction is represented by the red dashed line, with its uncertainty represented by the red shaded area. The fourth panel is missing the X-ray PA measurement, as the IXPE PD measurement is a 3σ upper limit and therefore the polarisation angle is not defined.