Selection of spectral pretreatment | r | RMSEC | RMSEP | RMSEV |

Constant | 0.962 | 0.417 | 0.343 | 0.473 |

SNV | 0.940 | 0.519 | 2.580 | 0.493 |

MSC | 0.886 | 0.708 | 3.485 | 0.674 |

First Derivative | 0.909 | 0.311 | 0.331 | 0.568 |

Second Derivative | 0.972 | 0.147 | 0.162 | 0.433 |

SNV+ Second Derivative | 0.922 | 0.414 | 0.449 | 0.588 |

MSC+ Second Derivative | 0.901 | 0.662 | 3.492 | 0.751 |

Constant | 0.962 | 0.417 | 0.343 | 0.473 |