Narrow region of the ESPRESSO combined spectrum of HE 0107−5240 around the Sr II line at 4077.7 Å (upper left), the G-band (upper right), the Sr II line at 4554.0 Å (lower left), and the Li doublet at 6707.8 Å (lower right). Derived values and adopted upper limits are shown in blue. Remarkably, at the ESPRESSO resolution the asymmetry in the profile of the Li doublet is clear and the upper limit (A(Li) < 0.5) is much more constraining than the UVES value from Christlieb et al. (2004) (A(Li) < 1.1) in red.