#DISTRIBUTEDBY=Aerosol Refractive Index Archive (https://eodg.atm.ox.ac.uk/ARIA/)
#SUBSTANCE=Okmok ash
#DESCRIPTION=Ash from Okmok volcanic eruption, July 2008
#REFERENCE=J. G. C. Ball, B. E. Reed, R. G. Grainger, D. M. Peters, T. A. Mather and D. M. Pyle, Measurements of the complex refractive index of volcanic ash at 450, 546.7, and 650 nm. J. Geophys. Res. Atmos., 120, 7747–7757, 2015.
#DOI=10.1002/2015JD023521
#FORMAT= WAVL N DN K DK
0.4500	1.594	0.01	0.00126	0.00016
0.5467	1.582	0.01	0.00145	0.00023
0.6500	1.579	0.01	0.00130	0.00017