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Fig. 2

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Physical parameters (i.e. dust and gas temperatures, H2 volume density) used in the present work to describe the circumstellar envelope. Density-enhanced shells are introduced in the current modeling as can be seen in the H2 volume density curve. The first shell is located at 15′′ and we assume an intershell distance of 12′′, the shells being 2′′ wide.

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