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Fig. 4

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Left panel: rate of angular momentum loss (normalised by the surface angular velocity) from infinitesimal rings centred on the rotational axis for each co-latitude θ. The width of each ring is given by rdθ. The rotation parameter ω is indicated for the curves with ω = 0 and ω = 1. The intermediate dashed curves are for ω = 0.5,   0.75,   0.9,   0.96,   0.98,   0.99,   0.995 respectively. The rate of angular momentum loss is expressed in terms of the normalised units where    is the mass-loss rate of the star, and R   the polar radius of the star. Right panel: same as left panel in a 2D colour plot. The x-axis is the co-latitude, and the y-axis the ratio ω = Ω/Ωcrit. The colour scale on the right indicates the local angular momentum loss from infinitesimal rings centred on the rotational axis for each co-latitude θ. The units are the same as in left panel. The smaller values are in blue and the larger ones in red.

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