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. 2016 Jun 15;6:27884. doi: 10.1038/srep27884

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The time represents immersion time after craters formation. Black closed squares (▪), red triangles (▴), blue closed circles (⦁) indicate the diameters of the crater formed by mechanically milling, the laser ablation craters with 800 nm, 1.0 J/cm², 15000 pulses, the laser ablation craters with 400 nm, 0.15 J/cm², 15000 pulses, respectively. All values are expressed as means ± standard deviation (SD).