k₂/k₃ ratio of Mg ii against magnetic field parameters. Left column shows points in the tornadoes, right column shows points everywhere else in the prominence. Red asterisks are points where Mg ii k profiles are reversed, green triangles are where Mg ii k profiles are single peaked (manually placed at a ratio of 0.5 to distinguish them). Blue diamonds correspond to complex profiles, described in Sect. 2.1.2. The black dashed line provides a cutoff for reversed profiles, where a ratio of 1 corresponds to a single-peaked profile. Inclination is with respect to the local vertical and azimuth is with respect to the line of sight.