Top panel: NH band in the UVES spectrum computed with A(N) = 5.7 and A(N) = 6.3 (blue lines) and with A(N) = 5.85(best fit, red line). Bottom panel: O I triplet in the ESPRESSO spectrum. The synthetic spectra have been computed with A(O) = 6.7, 7.3 (blue lines) and the best fit A(O) = 7.06 (red line). The crosses represent the observed spectra. Theabundances are raw values. The N abundances must be corrected by –0.4 (shift of the Kurucz log gf values) and the oxygen abundance by –0.1 (NLTE).