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1 Introduction
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2 Simulating the circumstellar bubble
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3 The circumstellar bubble during main sequence and LBV phase
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4 The circumstellar bubble during the Wolf-Rayet phase
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5 Calculating the column density
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6 Chemical composition of the circumstellar bubble
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7 The absorption features during the LBV and Wolf-Rayet phase
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8 Conclusions
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References
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