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. 2020 Nov 21;413(4):1009–1016. doi: 10.1007/s00216-020-03059-9

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© The Author(s) 2020

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Fig. 2 — Photo of the modified 1/16″ PTFE ferrule with seven 0.5-mm bores and 250-μm-ID standard fused silica GC columns inserted (Rtx-Volatiles, Restek GmbH, Germany)