Zoom-in spectra for PKS 0447-439 and the two standard stars Feige 110 and GD 108 in the wavelength interval corresponding to the claimed Mg II absorption lines (Landt 2012). In the top panel we superimpose on the spectrum of PKS 0447-439 a model of the Earth atmospheric absorption (in blue), derived from the position and relative strength of known telluric lines (see text). The two vertical dashed lines mark the frequency of the previously claimed Mg II absorption at z = 1.246, which corresponds instead to atmospheric features.