Measured and modeled Stokes parameters for PSR J0742−2822 as a function of time and position angle Φ′ = Φ + α, where Φ is the parallactic angle and α is the orientation of the horn at a given time. The pulsar was observed at 1484 MHz with the NUPPI backend, in an observing mode where the feed horn is made to rotate by 3° per minute, during the ~ 1-h observation. The modeled Stokes parameters, represented as dashed lines, were determined by analyzing the data with the Reception model of PSRCHIVE, enabling the determination of the polarimetric response of the telescope. The data points shown in this plot correspond to the Stokes parameters in the phase bin in which the pulsar is brightest, with 512 bins per rotation in this case. See Sect. 2.2 for the description of the analysis.