| back_trans | Back-transformation | 
| calculate_metrics | Reconstruction metrics | 
| colScale | Scale columns of a matrix | 
| colUnscale | Unscale columns of a matrix | 
| cv_mb | Cross-validation | 
| KGE | Kling-Gupta Efficiency | 
| lsq_mb | Least square with mass balance penalty | 
| make_Z | Make cross-validation folds. | 
| mb_fit | Fit parameters with mass balance criterion | 
| mb_reconstruction | Mass-balance-adjusted reconstruction | 
| nRMSE | Normalized root-mean-square error | 
| NSE | Nash-Sutcliffe Efficiency | 
| obj_fun | Objective function from parameters | 
| p1Seasonal | Seasonal streamflow at P.1 station | 
| pc3seasons | Principal components of tree rings | 
| prepend_ones | Prepend a column of ones | 
| RE | Reduction of Error | 
| rowScale | Scale rows of a Matrix | 
| rowUnscale | Unscale rows of a matrix |