P versus θ_p of stars projected on L1521F. The histogram of the θ_p with binsize 10° is also shown. The position angle of the outflow direction is shown as a broken line. The direction of the Galactic plane at the latitude of this cloud is shown as a dotted line. The polarisation results of the stars within a circular region of 1° around L1521F obtained from the Heiles (2000) catalogue are shown as open square symbols. Filled circles represent the sources observed by us.