Towards Spectral Variation Analysis: A Data Quality Framework for Non-Targeted Methods. - Nichani, Kapil; Uhlig, Steffen; San Martin, Victor; Colson, Bertrand; Hettwer, Karina; Steinacker, Ulrike; Kaspar, Heike; Gowik, Petra; Kemmlein, Sabine (Molecules, 2025)