Fig. 2.
Panel a: magnetosphere-disk radius r at various positions (interval [1]–[17]) in X-ray color–color diagram. Panel b: similar to (panel a), but for the magnetic field strength B at r. The observed CCD points of 4U 1728-34 are taken from the paper by Di Salvo et al. (2001). The figure is reproduced with the RXTE dataset used by Di Salvo et al. (2001).
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