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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 .
"NH4+_aerosol_H2O_Leaching_<1um_SD" .
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"Concentration standard deviation of soluble ammonium {soluble_NH4+ CAS 14798-03-9} per unit volume of the atmosphere [aerosol <1um phase] by filtration, water leaching"@en .