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. 2014 Aug 14;9(8):e103547. doi: 10.1371/journal.pone.0103547

Figure 5. Calibration images.

Figure 5

(a) 1 mm graticule with 10 µm subdivisions at 206.8× magnification; (b) 1 µm latex beads at 206.8× magnification; (c) 15 mm ruler at 15.7× magnification with 1 mm subdivisions.