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1 Introduction
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2 Observations and data reduction
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3 HS 0417+7445
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4 HS 1016+3412
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5 HS 1340+1524
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6 HS 1857+7127
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7 HS 2214+2845
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8 The orbital period distribution of dwarf novae
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9 Constraints on the space density of CVs
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10 Conclusions
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References
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Online Material
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