J1505+0326: Apparent long rotation. With the exception of the left-most point, each angle measurement (solid symbols) is paired with its 180° conjugate (empty symbols). The upper values note EVPA differences (Δχ) and the lower values their uncertainties (σ_Δχ). Red marks highlight points in which the uncertainty (σ_Δχ in Δχ is so large that both solutions of Eq. (3), χ and χ + π, could be valid, making the direction of the rotation uncertain.