...(Popovic et al. 2003)

Simulations of X-ray line profiles are presented in a number of papers, see, for example, Zakharov & Repin (2002a, 2003c, 2002b, 2003a, 2002c) and references therein, in particular Zakharov et al. (2003) showed that an information about magnetic filed may be extracted from X-ray line shape analysis; Zakharov & Repin (2003b) discussed signatures of X-ray line shapes for highly inclined accretion disks.

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... region

For example, Chartas et al. (2002a) found evidence for X-ray microlensing in the gravitationally lensed quasar MG J0414+0534 (z=2.639), where according to their estimates $M_{\rm SMBH}$ is in the range $3.6 \times 10^{6}(\beta/0.2)^2$ and $1.1 \times 10^{7}(\beta/0.2)^2 ~M_\odot$ ( $\beta \sim 1$). Therefore a typical emission region is much smaller than the Einstein-Chwolson radius $R_{\rm EC}$, since following Chartas et al. (2002a) one could assume that the emitting region corresponds to (10-1000) r_g or ${\sim} 1.5 \times 10^{14} {-} 1.5 \times 10^{16}$ cm for a $10^{8}~M_\odot$ black hole.

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