To access the data, click or select the words “Appendix 2.” The four curves correspond to STR loci labeled with four different fluorescent markers (blue=FAM, green=VIC, black=NED, red=PET). The abscissa (x-axis) represents the length of DNA fragments (unit: bp), reflecting the length of STR repeat sequences. The ordinate (y-axis) represents the intensity of fluorescent signals, indicating the amount of amplification products.