#SUBSTANCE=Spurr ash #DESCRIPTION=Ash from Spurr volcanic eruption, August 1992 #REFERENCE=Ball, J. G. C., B. E. Reed, R. G. Grainger, D. M. Peters, T. A. Mather, and D. M. Pyle (2015), Measurements of the complex refractive index of volcanic ash at 450, 546.7, and 650 nm. J. Geophys. Res. Atmos., 120, 7747–7757. #DOI=10.1002/2015JD023521 #FORMAT= WAVL N DN K DK 0.4500 1.570 0.01 0.000939 0.00010 0.5467 1.563 0.01 0.00105 0.000083 0.6500 1.555 0.01 0.00125 0.00010