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Figure 5: Bootstrap plot  central tendency analysis of the depth of penetration (Xaxis, µm) of the (a) Er:glass laser (mean 679 µm, median 580 µm, midrange 884 μm), (b) Er:YAG laser (mean 825 µm, median 525 µm, midrange 1162.5 µm) and (c) CO _{2} laser (mean 895 µm, median 600 µm, midrange 2520 µm) 
