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. 2022 Dec 23;864:161152. doi: 10.1016/j.scitotenv.2022.161152

Fig. 4.

Fig. 4

Real-time early warning methods: OBM and PPCS based on N1 (gc/L):

a. First early warnings of each peak identified by OBM (N1, gc/L) with Method I defined peaks

b. First early warnings of each peak identified by OBM (N1, gc/L) with Method II defined peaks

c. First early warnings of each peak identified by OBM (N1, gc/L) with Method III defined peaks

d. Early warnings identified by PPCS (N1, gc/L) with Method I defined peaks

e. Early warnings identified by PPCS (N1, gc/L) with Method II defined peaks

f. Early warnings identified by PPCS (N1, gc/L) with Method III defined peaks.