rmin and rs as a function of ISM number density nISM. The stand-off distance rs is plotted using wind parameters from Najarro et al. (2011, lower dotted line) and Vink et al. (2000, upper dotted line). rmin reaches a maximum at nISM< 10 cm-3 where the drag force Fd becomes negligible. rs and rmin show the same dependency on ISM density for nISM> 10 cm-3.
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