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We present observations which probe the small-scale structure of theinterstellar medium using diffuse interstellar bands (DIBs). Towards HD168075/6 in the Eagle Nebula, significant differences in DIB absorption arefound between the two lines of sight, which are separated by 0.25 pc, and{\lambda}5797 exhibits a velocity shift. Similar data are presented for fourstars in the {\mu} Sgr system. We also present a search for variations in DIBabsorption towards {\kappa} Vel, where the atomic lines are known to vary onscales of ~10 AU. Observations separated by ~9 yr yielded no evidence forchanges in DIB absorption strength over this scale, but do reveal an unusualDIB spectrum.

Diffuse interstellar bands as probes of small-scale interstellar structure