Left panel: line bisectors computed using the full HARPS instrument range (~380−670 nm) from CIFIST 3D model spectra at μ = 1.0 (black solid line), μ = 0.79 (black dashed line), μ = 0.41 (black dot-dashed line), and μ = 0.09 (black dotted line). We also show line bisectors for observed solar spectra for a quiet-Sun region (red solid line) and a spot (red dashed line) and the bisector computed with StarSim from the integrated CCF of an unspotted photosphere of a Sun-like star (blue solid line). Right panel: zoom of the left part of the left plot showing a comparison with the bisectors of the Sun-like stars α Cen A (green solid line) and 18 Sco (orange solid line) observed with the HARPS South instrument (X. Dumusque, private communication).
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