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. 2022 Mar 17;414(18):5445–5459. doi: 10.1007/s00216-022-03925-8

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Fig. 2 — 2D plots (254 nm) of the µLC × LC separation achieved coupling a PFP column (¹D) and a C18 column (²D) using a ²D multi-segment shifting gradient. a Cookie hemp strain; b gelato hemp strain