γ Vel field. Left: DIB EW and estimated extinction as a function of target distance. Two star groups are present that probe different regions of the foreground cloud. Right: the relation between EWs and extinction. There is a significant scatter, the largest of the 7 fields. Several outliers have stronger DIBs than the averaged relation. These departures from linearity are very likely linked to the influence of the Wolf-Rayet star environment.