Sample spectra of windows used to find Zeeman pairs. Squares and triangles mark RCP and LCP emission, respectively. Gaussian fits to the lines are shown, and lines and features are numbered for reference. The number in the upper right corner marks the transition frequency, in MHz. (a–d) Windows in G351.775−0.538, G032.744−0.076, K3−50, and G045.465+0.047. The 1665 and 1667 MHz windows in (a) and (c) are centered at approximately the same position. The magnetic field and center velocity deduced from Zeeman splitting are shown in (a).