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The nucleotide diversity (Pi) of four Selenicereus plastomes (analyzed using DnaSP with a sliding window analysis (window length: 500 bp, step size: 500 bp)). The horizontal and vertical axes respectively represent the midpoint position of the window and the Pi value of each window. Pi values in one intergenic (trnF-GAA-rbcL, 0.05567) and two protein-coding genes (accD, 0.00667–0.167; ycf1, 0.004–0.059) were greater than 0.05
