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. 2019 Mar 22;15:28. doi: 10.1186/s13007-019-0416-x

Fig. 5.

Fig. 5

The relationships between predicted and measured yield. R2, RMSE, RE and RRMSE mean correlation coefficient, root mean square error, relative error and relative root mean square error, respectively. NRI and NBI indicate the normalized redness intensity and normalized blueness intensity