Fig. 1
For anX-ray emitting shell moving through a wind with a β = 1 velocity law, characteristic time, distance, and velocity for which the R = f∕i line ratio changes. Upper panel: characteristic time t1∕2, relative to the wind flow time, t∞. Lower panel:distance and velocity in the wind corresponding to t1∕2. See text for explanation of the vertical lines in the upper panel.
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