Top: map of the angle between the magnetic field and filaments detected in Orion B at a 5′ resolution. The filaments are red when they are parallel to the magnetic field and blue when perpendicular to it. Bottom: distribution of the relative orientation of the filaments and the magnetic field for the S1, S2, and robust skeletons. The dotted lines (and the shaded areas) present the distribution (and the corresponding ± 1σ uncertainties) that we would get if the two quantities were uncorrelated. The uncorrelated distribution is obtained by a Monte Carlo sampling of the magnetic field and filament position angles.