Slices though the Milky Way model described in Sect. 2.2. Clockwise from top left to bottom right: gas density n_g, electron density n_el, velocity v_g, and magnetic field strength B. The red circles and white labels indicate the observer positions considered in the paper. The insets in the n_g map (top left) show the local environment for each of the observers P1, P2, P3, and P4, and the blue spirals indicate the potential of our model. The yellow and red vector fields show the orientation of the magnetic field (bottom left) and the velocity field (bottom right).