Fig. 3
Portion of the FEROS spectrum of WASP-18 around Li doublet at 6707.8 Å. This particular spectrum was taken on 19 Sept. 2010. We use arbitrary units for flux on Y axis. For comparison we also plot the FEROS spectrum of τ Boo in the same spectral range. The spectrum of τ Boo has been scaled and shifted in wavelength by +0.42 Å (accounting for its radial velocity) for an easier comparison with WASP-18. The Li feature is strong in WASP-18 and absent in τ Boo.
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