LSD Stokes I (bottom), and Stokes V (top) calculated using HARPS spectropolarimetric observations of HD 57372 recorded on different rotation phases. The employed line mask includes all identified spectral lines that appear to be unblended or minimally blended in. The rotational phases and the measured longitudinal magnetic field strengths are presented on the top. The dashed lines in the Stokes V panels indicate the mean uncertainties, which for the presented line mask are of the order of the thickness of these lines.