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1 Introduction
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2 Observations
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3 Single dish data of RX Boo
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4 Interferometric data of RX Boo
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5 The circumstellar envelope of RX Boo
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6 Single dish data of SV Peg
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7 Radio and optical variability in SRVs
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8 Discussion
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9 Conclusions
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References
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Online Material
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Appendix A: Single-dish data of RX Boo and SV Peg
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