Fig. 3
XZ section of the dust shell geometry assumed in our modelling (Y axis is perpendicular to the figure). The shell of a thickness, ΔR, and a radius, Rs, is illuminated by a source in its centre. For α>αtrunc the shell is truncated, i.e. dust is present only within the full lines in the figure. The dust distribution is symmetrical in regard to the Z axis. The observer is in the XY plane.
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