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Fig. 8
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Ratio S (blue)/5 (red) of the U Her H2O maser emission, of the Vlos < −15 km s−1 [S (blue)] and > −15 km s−1 [S (red)] part of the maser velocity range with respect to the stellar velocity, as a function of TJD. The vertical dashed lines indicate the (modelled) optical maxima with P = 405 days.
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