Cross-correlation function, main line profile observables, and vrad (based on a δ Cep HARPS-North spectrum cross-correlated with our medium template on the green range, see text). From left to right and top to bottom: CCF, normalised CCF, normalised CCF Gaussian fit, normalised CCF biGaussian fit. On all plots the CCF is displayed as a black solid line, the CCF continuum as a solid straight red line and the vrad at the CCF minimum as a vertical dotted black line. On the top left plot, the CCF core vrad range (i.e. Δcore) is highlighted in green. On the top right plot, the area covered by the CCF core and used for the EW and RVcc-c integration is highlighted in green. The letters CT and D designate the contrast and depth of the CCF core, respectively (as defined in the text). On the bottom right plot, the FWHMs corresponding to the blue and red parts of our biGaussian model are displayed as a blue and red arrow, respectively. The inserts are zooms in vrad on the CCF core.
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