Diffuse interstellar bands in Upper Scorpius: probing variations in the DIB spectrum due to changing environmental conditionsD. A. I. Vos, N. L. J. Cox, L. Kaper, M. Spaans and P. EhrenfreundA&A, 533 (2011) A129DOI: https://doi.org/10.1051/0004-6361/200809746