Tilt angles as a function of Galactic height for different radial and azimuthal positions across the Galaxy. The red squares, green diamonds, and blue crosses show the measurements for ϕ = [165 ° ,180 ° ,195 ° ], respectively. The black starred symbols show the measurements irrespective of azimuth (as in Sect. 4.1). Given the error bars, there are only small differences in the tilt angles for the different azimuths explored. The solid black line denotes the trend expected for spherical alignment.