Polarised light for the embedded YSOs Parsamian 21 (left panels) and Elia 2-21 (right panels). The top panels show the polarised intensity, PI, with a blue colour map, while the grey colours display the absolute values of the linear Stokes components |Q^±| and |U^±|. In the bottom panels, these values are scaled by the squared separation from the centre. The dashed lines delineate the sections of the sky observed by one of the components. These sections overlap in the centre, resulting in an eight-pointed star, where the polarised intensity image can be computed as Q and U are both covered. The south-eastern region of the U⁻ observation of Parsamian 21 is contaminated with signal from another dithering position, introduced during the sky-subtraction.