We reconstructed the complete 3D magnetic field morphology of Orion A using Galactic magnetic field models, as well as line-of-sight and plane-of-sky magnetic fields. This 3D field morphology is depicted in the above 3D file (OrionA_B1B2.obj) and in Tahani et al. (2022).
The file `OrionA_B1.obj' depicts the 3D magnetic field of Orion A, described in Tahani et al. 2022a (B1). The field morphology B2, as discussed in Tahani et al. (2022; See Fig. B.1), is similar to B1, and is slightly inclined (with respect to the cloud axis) and is shown at a different location of the cloud. The file 'OrionA_B1B2.obj' illustrates both of these fields at the same time. Both of these fields look somewhat like a semi-convex shape from our point of view. However, from the cloud's perpective one (B1) appears to be slightly concave. This is due to the high inclination of the Orion A cloud. Both of these have their centre of bending at greater distances (relative to us) and mostly on the cloud.
'OrionA_B3.obj' OrionA S3 demonstrates a third scenario that, while consistent with line-of-sight and plane-of-sky magnetic fields, is incompatible with the Galactic Magnetic Field Model used in Tahani et al. 2022a (and not accepted).