... energy

We neglect here any distinction of the K $\alpha_{1}$ line at 6.404 keV and K $\alpha_{2}$ line at 6.391 keV as can be found in atomic physics.

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... geometry

Color images of disk distributions and emission line profiles can be found at http://www.lsw.uni-heidelberg.de/users/amueller

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... profile

Thermal broadening has a tiny contribution and can be neglected.

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