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ASTM G173-03 standard
data("ASTMG173")
list with location, lat-long-elev, and two columns for tau (b, d)
Optical depth
Acevedo, M.F. 2018. Introduction to Renewable Electric Power Systems and the Environment with R. Boca Raton, FL: CRC Press. (ISBN 9781138197343)
# NOT RUN { X <- ASTMG173 # }
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