Fig. 1
High resolution visible spectrum of W Hya. The spectrum is based on the data obtained by Uttenthaler et al. (2011), and we applied the flux calibration to their spectrum as described in Sect. 2.1. The FWHMs of five filters used in our SPHERE-ZIMPOL observations are marked with the horizontal bars. The insets show enlarged views of the spectral region of the CntHa and NHa filters. The arrow in the lower inset marks the position of the Hα line.
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