(a) Linear model (original data) for field versus with least-squares minimisation and 95% CI (narrow band) and 95% PI (broad band) |

(b) Sigmoidal model (original data) for field versus with least-squares minimisation and 95% CI (narrow band) and 95% PI (broad band) |

(c) Sigmoidal model (original data) for field versus with Pearson minimisation and 95% CI (narrow band) and 95% PI (broad band) |

Figure 8 |