Fig. 1
GBT spectra of the five NLS1 galaxies where H2O maser emission has been detected so far. The vertical line segment indicates the recessional velocity of the galaxy. The red dotted lines in the spectra of NGC 4051 and NGC 5506 indicate the velocity ranges covered by the VLA spectra. The (a)–(c) labels for NGC 4051 indicate the three groups of features discussed in Sect. 4.2.
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