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Archives of Environmental Contamination and Toxicology (2022) 82:481—492 
LB 
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Fig. 3 Variation of elemental mass fractions in the < 20 um grain size 
fraction of TCEs within each observed sample location. Each box 
covers all measured mass fractions within the observed time frame of 
‚en years. Numbers in the box plots indicate upper and lower whisk- 
ers as well as median values 
A Springer