Total intensity (I, black solid line) and linear polarization intensity (red solid line) spectra of the H₂O maser features 012, 016, 036, 058, 063, and 128 (upper panel). The linear polarization intensity spectra have been multiplied by a factor of three for 036, 063, and 128. The linear polarization fraction (black solid line, left scale) and the linear polarization angle (dashed black line, right scale) are also shown (lower panel).