N_H i − N_C iv diagram for log  N_H i = [12.0,17.8] from the high-order fit sample at 1.9 < z < 3.2. The upper panel is for the Δv_C iv = ±100 km s^-1 sample, while the lower panel for the Δv_C iv = ±10 km s^-1 sample. Open circles represent H i absorbers associated with all the possible C iv components, since a single H i line could be assigned to several C iv lines. On the other hand, red filled circles indicate a H i absorber associated with only one closest C iv. The total number of open (filled) circles is 1082 (451) and 184 (163) for the Δv_C iv = ±100 km s^-1 and Δv_C iv = ±10 km s^-1 sample, respectively.