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# Table 4 Coefficients and correlation coefficients of fitting curves in Figure 10(b)

Equation | \(y={\mathrm{y}}_{0}+{\mathrm{Ae}}^{{\mathrm{R}}_{0}x}\) | |||||||
---|---|---|---|---|---|---|---|---|

Defect size (mm) | 0.4 | 0.8 | 1.2 | 1.6 | ||||

Parameter | Value | Error | Value | Error | Value | Error | Value | Error |

\({\mathrm{y}}_{0}\) | 131.421 | 0.7168 | 139.093 | 1.5352 | 141.989 | 1.958 | 141.401 | 2.357 |

A | 34.2583 | 1.5974 | 32.449 | 3.4572 | 31.987 | 4.1131 | 34.896 | 4.764 |

\({\mathrm{R}}_{0}\) | − 4.591 | 0.5216 | − 4.697 | 1.2232 | − 4.092 | 1.2711 | − 3.834 | 1.2647 |

\({\mathrm{R}}^{2}\) | 0.983 | 0.915 | 0.880 | 0.867 |