Low and high ions in the COS spectra of WD2257-073. Also shown are the OVI lines as observed by FUSE. All velocities are heliocentric. Red doted lines are Voigt fits to the detected absorptions. The solid vertical line corresponds to the centroid of the cold-warm ISM absorption as traced SiII. The dotted line corresponds to the centre of the SiIV, NV and CIV lines. The dot-dot-dashed line corresponds to the Bar10 photospheric velocity.