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Fig. 8.

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Demonstration of the rotation of the phase spiral with visualisation of how the model found the angles. Upper row: phase spiral at low, medium, and high Galactic azimuth (ϕ) with the angle θ 0,  model marked with a red line and θ 0,  model = 0 marked with a white dashed line. Lower row: corresponding spiral perturbations fitted to the data with θ 0,  model marked with a red line and the measurement distance for θ 0,  model marked with a white ring.

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