Notes. The observations of SW Vir for which a neutral density filter (ND1) was used are marked using italic font for the filter name. DIT is the exposure time of the individual frames, and NDIT is the number of frames per exposure. Each cycle (DIT × NDIT) was repeated four times to obtain + Q, − Q, + U, and − U frames, and the whole cycle was repeated several times for each filter and epoch until the total exposure time was reached. AM and θ are the airmass and the visible seeing at the time of the observations, and S_H and S_λ are the Strehl ratios observed at the H-band and this ratio calculated at the observed wavelength (see Sect. 2.2), respectively. λ_° and Δλ are the central wavelength and the FWHM of the filters used. FWHM_⋆ and FWHM_PSF are the FWHM obtained by fitting a 2D Gaussian to the observed images of the science targets and the PSF references, while FWHM is the FWHM of the model Gaussian star that best fits the observations. The position angle of the Gaussian ellipse is given in parentheses after the minor and major values of the FWHM. Peak PD is the observed peak value of the polarisation degree. ^(†) - For W Hya, we used the observations of p Vir as the PSF reference for the fitting procedure (see text).