"Concentration standard deviation of silicate {SiO44- CAS 17181-37-2} per unit volume of the atmosphere [aerosol >1um phase] by filtration and spectrophotometry"@en .
"SD_SI04_>1um_aerosol" .
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"The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en .
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