Galactic magnetic field associated with the Orion A cloud. The background grayscale image shows the extinction map from Kainulainen et al. (2009). The yellow line represents the division between the tail and the head of the cloud. The region of Orion A with longitudes less than ∼210° is referred to as the “head” of Orion A, while the portion with longitudes greater than ∼210° is referred to as the “tail”. The red vectors show the Coherent GMF model projected onto the plane of the sky. The cyan line illustrates an approximate filament axis.