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Fetal fraction trends with respect to gestational age. Fetal fraction (ff) estimated with the four tools, from left to right: Defrag_a, Defrag_b, Seqff, iSanefalcon, shown as violin plots accordingly to gestational age intervals for cohort 1 (A–D) and cohort 2 (E–H). The number of samples is reported above each violin plot. Color code: cohort 1, gold and cohort 2, grey.
