Lithium abundances vs. Teff for planet host stars (red filled circles) and single stars (blue open circles) from HARPS, together with other planet hosts (green triangles). Squares are stars that only host Neptunian- or Super-Earth-type planets. Down arrows represent A(Li) upper limits. The straight line at A(Li) = 1.4 matches the upper envelope of the lower limits for most of our stars.
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