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Fig. 8.

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Comparison of azimuthally averaged footpoint rotation rates in the corona from low solar activity to high solar activity, left and right respectively. The solid black circle distinguishes the solar photosphere, below which the internal rotation profile derived from helioseismology is shown (see Larson & Schou 2018). The outer dashed line shows the source surface of the underlying PFSS model, beyond which the magnetic field is radial.

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