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Fig. 12.

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Sketch of the shock geometry (a view from the top). The blue line shows the shape of an approximately spherical shock propagating through a hydrostatic atmosphere. This geometrical setup is used to derive the density jump of the X-ray emitting gas and to estimate the shock Mach number. The red line shows the shock modified by residual motions of the gas infalling along the filament. The curvature was intentionally exaggerated for clarity.

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