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Fig. A.1

Average cross-power (Stokes I) spectra of the eleven observed 12 GHz and 22 GHz masers from the first epoch. Upper panels: full amplitude scale. Lower panels: enlarged view of the weaker spectral features. Dashed lines mark the LSR velocities (from CO line data) of molecular cores hosting the star-forming regions.
This figure is made of several images, please see below:
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