Previous determinations at z < 1.5 of the redshift density l(z) of LLSs (τ > 1) from spectroscopic surveys: triangle (green), Stengler-Larrea et al. (1995) with the numbers reported by Songaila & Cowie (2010); solid circle (blue), Ribaudo et al. (2011); solid square (red), Songaila & Cowie (2010) from GALEX grism spectroscopy. The lines are redshift evolution laws used for comparison: the solid line (blue) is from Ribaudo et al. (2011), derived from their UV data; the dotted line (red) is from Songaila & Cowie (2010), based on high-redshift data and a combination of their GALEX data and those of Stengler-Larrea et al. (1995).
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