Maps of the intensity, I_d (left), and of the two Stokes parameters for linear polarization, Q_d (middle) and U_d (right), of the polarized dust emission at 353 GHz toward the G139 region defined in the first paragraph of Sect. 3. Top row: observational maps from Planck (Planck Collaboration 2020b). Middle row: same maps resampled to the common 26 × 26 pixel grid of the gas tracers (pixel size = 4^′). Bottom row: statistical uncertainties in the Planck maps resampled to the 26 × 26 pixel grid. The total uncertainties are equal to the quadratic sums of the statistical uncertainties and the photometric calibration uncertainties, which in turn are given by 0.0078 I_d for I_d(Planck Collaboration 2016b, 2020b) and 0.015 P_d for Q_d and U_d (Planck Collaboration 2020b,c).