Overlay of the water masers detected with the VLBA in W3(H₂O)  onto the 1.4 mm continuum emission mapped with the PdBI by Wyrowski et al. (1999) (gray scale and black contours). The circles show positions of the H₂O masers, while the colors denote their l.o.s. velocity in km s^-1 (color scale on the right-hand side). The three 1.4 mm continuum peaks identified by Wyrowski et al. (1999) are labelled A, B, and C, from east to west. Contour levels correspond to steps of 24 mJy beam^-1 (starting from 47 mJy beam^-1). The insets show the linear polarization vectors of individual maser features in different clusters (from a to e), where the length of the line segments scales logarithmically with the polarization fraction (in the range P_l = 0.9−42%). We also report the magnetic field strengths (in mG) along the l.o.s. (B_l.o.s.) in the maser features for which we measured the Zeeman splitting. The positions are relative to the reference maser feature used for data self-calibration (ID 018 in Table D.1).