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ChromVI A2_L • Detection <br /> • KMn04 X Non-Detect <br /> 600000 <br /> 500000 <br /> 400000 <br /> 300000 t <br /> 200000 <br /> 1 { � <br /> 100000 <br /> 1 � <br /> 2016. 5 2017 . 0 2017.5 2018.0 2018 . 5 2019 . 0 2019 . 5 2020. 0 2020. 5 <br /> Year <br />