Cosmic Origins Spectrograph ultraviolet spectra of the five LyC leakers from Izotov et al. (2016a,b), with the global first order polynomial fit shown as the dashed blue line. The spectra are ordered from top to bottom as J0925+1403, J1152+3400, J1333+6246, J1442−0209 and J1503+3644. The observed wavelength is given on the bottom axis and the restframe wavelength is given on the upper axis. Along the upper axis we label interstellar absorption lines in the restframe of the target galaxy, while the lower axis shows possible Milky Way contamination.