Fig. 1
STELLA spectroscopy of XX Tri. a) A section of a representative single spectrum showing a subset of the spectral lines used for the Doppler imaging inversions. b) The full time-series radial velocities from a cross-correlation analysis. It shows the rotational phase sampling for the STELLA spectra. Each dot is from a full echelle spectrum, covering the wavelength range 390–880 nm. c) A section of b) referring to the observational season 2008/09. The dotted line represents a radial-velocity fit.
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