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Fig. 9

image

Variation with phase of the equivalent hydrogen column density along the line of sight from the apex. The column is computed according to the physical parameters given in Table 2 and for an inclination of 58.̊8. We show the curves expected for various mass-loss rates: 0.5 × 10-5 M yr-1 (lower curve), 1.0 × 10-5 M yr-1 (middle curve), and 3.2 × 10-5 M yr-1 (upper curve, value adopted in Table 2). The figure also includes (open circles) the four values for the common column fits deduced from the XMM-Newton observations. In addition, the two filled squares indicate the column in front of the sole hard component for the XMM-3 and XMM-4 pointings.

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