Observed magnetic fields of the Orion A molecular cloud. The B_∥ data were obtained by Tahani et al. (2018) and the B_⊥ lines were observed by the Planck Space Observatory. The blue (red) circles show magnetic fields toward (away from) the observer, and the size of the circles represents the strength of the magnetic fields. The red and drapery lines show the B_⊥ orientation. The background grayscale image is the visual extinction map obtained by Kainulainen et al. (2009). Tahani et al. (2019) suggested that an arc-shaped magnetic field morphology (as illustrated in the inset) is the most probable model that can explain the observed B_∥ reversal across the cloud.