View of the CH₃OH maser features detected around G30.70-0.07 (W43-MM2). The reference position is the estimated absolute position from Table 1. Triangles identify CH₃OH maser features whose side length is scaled logarithmically according to their peak flux densities (Table A.1). Maser local standard of rest radial velocities are indicated by color (the assumed velocity of the region is km s⁻¹; Nguyen-Lu’o’ng et al. 2013). The 0.8 Jy beam⁻¹ symbol is plotted for comparison. The linear polarization vectors, scaled logarithmically according to the polarization fraction P_l (P_l = 0.07–1.2%; see Table A.1), are overplotted. In the bottom right corner, the corresponding error-weighted orientation of the magnetic field (⟨Φ_B⟩, see Sect.5.1) is also shown. The two dashed segments indicate the uncertainty. The dashed line is the best least-squares linear fit of the CH₃OH maser features (°).