From top to bottom: correlation between the equivalent widths of the strongest NIR λ15273 DIB and of the five optical λλ5797, 6196, 6614, 5780, and 6283 DIBs. Compared to the Cox et al. (2014) targets, the OHP-SOPHIE and TBL-NARVAL targets correspond to shorter sight line and weaker absorptions. For the λ6283 DIB only the latter two datasets are presented. Correlation coefficients r and reduced χ2 resulting from the linear ODR fit are indicated in each plot.