Fig. 1
Spectra of the H2O (1029 → 936) maser emission in three water-fountain nebulae. The red line indicates the spectrum obtained in the epoch May 15, 2013, and the blue line indicates the spectrum obtained in the epoch July 6, 2013. The systemic velocity reported in the literature is indicated with a vertical dashed line. The velocity and flux ranges are different for each source.
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