Redshift evolution of the neutral gas mass density, Ω_g. The black bins correspond to Ω_g measured from DLAs (Péroux et al. 2003b) plus sub-DLAs (combined sub-DLA) contribution. The gray bins show the DLA contribution to the Ω_g from Péroux et al. (2003b) in the same redshift bins. The triangles at z = 0 represent the Ω_g measured in local galaxies by Zwaan et al. (2005a, cyan), Martin et al. (2010, orange), and Braun (2012, magenta), respectively. The open purple star at z = 0.24 illustrates the H i content measured from the star-forming galaxies by Lah et al. (2007). The blue squares at z < 2 represent the H i measured from Mg ii selected DLAs by Rao et al. (2006). The red bins correspond to the Ω_g measured from SDSS by Noterdaeme et al. (2012).