Magnetic field and total gas column density measured towards a sub-region of the Aquila rift. The colours represent the total gas column density, N_H, inferred from the Herschel observations (Könyves et al. 2015). The “drapery” pattern, produced using the line integral convolution method (LIC, Cabral & Leedom 1993), indicates the orientation of magnetic field lines, orthogonal to the orientation of the submillimetre polarization observed by Planck at 353 GHz. The black squares correspond to the location of the cores with M> 3 M_⊙, pre-stellar and protostellar, from the catalogue presented in Könyves et al. (2015). The black polygons correspond to the two portions where we compare the results of the HRO analysis, which contain W40 (left) and MWC 297 (right), respectively.