Fig. 2: The prediction diagram for train and test sets of each model (DT, RF, and XGBoost).
From: Machine learning for efficient CO2 sequestration in cementitious materials: a data-driven method

The black line represents the baseline, the red line indicates the 20% upper offset, the yellow line indicates the 20% lower offset, the green circle marks the training set, and the blue circle marks the test set.