#DISTRIBUTEDBY=Aerosol Refractive Index Archive (www.atm.ox.ac.uk/project/RI/) #DESCRIPTION=Sample collected from stratosphere 15km away on 20 May 1980. #SUBSTANCE=Mt. St. Helens ash 18 May 1980 eruption #SAMPLEFORM=Solid #TEMPERATURE= #CONCENTRATION= #DOI=10.1126/science.211.4484.836 #REFERENCE= E. Patterson, measurement of the imaginary refractive index ##between 300 and 700nm of Mount St. Helens ash, Science, 211, 1981 #CONTACT= #COMMENT=Digitised from publication graph, absolute accuracy is unknown. #FORMAT=WAVL K 0.30085175 0.0071030902 0.31999970 0.0047843000 0.34967812 0.0035800100 0.40172131 0.0020904799 0.50318598 0.0019890000 0.60080436 0.0015927000 0.70116208 0.0012024400