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Fig. 19
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RR Aql H2O maser light curve. See Fig. 6 for details. 5 (tot) was determined in the velocity range 22 < Vlos < 34 km s−1. The sine curve (blue) was obtained by a fit to the 1990–2011 radio measurements with a period Popt = 400 days and is delayed by ϕlag = 0.21, i.e. by 84 days with respect to the optical light curve.
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