Rest-frame equivalent widths of metal lines as a function of log N(H i). Black are ESDLAs, red are GRB-DLAs from Fynbo et al. (2009) and de Ugarte Postigo et al. (2012). The open/filled squares at log N(H i) = 22.8 correspond to EW in the GRB-DLA 080607 measured at R = 400 and R = 1200 respectively. The horizontal dashed lines correspond to the average EWs measured from the stacked spectrum.