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. 2021 Apr 29;786:147398. doi: 10.1016/j.scitotenv.2021.147398

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Fig. 2 — Comparison of concentration efficiency of the in-house flat membrane ultrafiltration method and Centriprep 50 kDa molecular weight cut-off filter units. Viral concentration of sewage samples (samples 1–11) and spiked positive control samples (PC, average of 3 samples; negative result (ID: 1) was substituted by LOD = 2640 GC/L for data visualisation.)