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{{ attachment:thuill_astme590_lambda | | width=800 }}
''actually, ASTM E'''4'''90''
{{ attachment:thuill_astme590_lambda.png | | width=640 }} 
 . [[ https://www.astm.org/Standards/E490.htm | ''actually, ASTM E'''4'''90'' ]]

Spectrum (last edited 2020-01-06 18:50:25 by KeithLofstrom)