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# Table 3 Coefficients and correlation coefficients of fitting curves in Figure 10(a)

Equation | \(y=\frac{{\mathrm{A}}_{1}-{\mathrm{A}}_{2}}{1+{(x/{\mathrm{x}}_{0})}^{\mathrm{p}}}+{\mathrm{A}}_{2}\) | |||||||
---|---|---|---|---|---|---|---|---|

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

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

\({\mathrm{A}}_{1}\) | 0.213 | 0.0046 | 0.486 | 0.0063 | 0.688 | 0.0093 | 1.00237 | 0.0161 |

\({\mathrm{A}}_{2}\) | − 0.002 | 0.0162 | 0.054 | 0.0180 | 0.087 | 0.0250 | 0.0921 | 0.0578 |

\({\mathrm{x}}_{0}\) | 0.779 | 0.0573 | 0.725 | 0.0296 | 0.719 | 0.0290 | 0.80069 | 0.0474 |

p | 2.478 | 0.3440 | 2.579 | 0.2271 | 2.689 | 0.0250 | 2.61041 | 0.3067 |

\({\mathrm{R}}^{2}\) | 0.994 | 0.998 | 0.997 | 0.996 |