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. 2022 Jun 17;414(19):5829–5836. doi: 10.1007/s00216-022-04145-w

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Fig. 3 — Calibration curve obtained by LC-FLD analysis of brodifacoum (15) following linear regression (top) and residual analysis (bottom) with a minimum requirement of r² ≥ 0.99 and residuals within ± 20% of the nominal value without any observable trend