A Direct Measurement of Atmospheric Dispersion in N-band Spectra: Implications for Mid-IR Systems on ELTsA. J. Skemer, P. M. Hinz, W. F. Hoffmann, L. M. Close, S. Kendrew, R. J. Mathar, R. Stuik, T. P. Greene, C. E. Woodward and M. S. Kelley1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, (2010) 05019DOI: https://doi.org/10.1051/ao4elt/201005019