(FUV−NUV) GALEX colours (black dots) and lower limit colours (red triangles) as a function of emission redshift for the quasar sample used by Ribaudo et al. (2011) for studying LLS statistics. Quasars circled in green colour (including the lower limits) have spectroscopically identified LLSs. The vast majority of quasars with (FUV−NUV) > 2 have spectroscopically identified LLSs.
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