Confusion matrices comparing the results of the model-comparison-based classification and traditional nebulae classification techniques for the full sample. The five classes included in the matrices are described in Sects. 6.1 and 6.2 for the new and traditional classifier respectively. The left matrix reports the completeness of the traditionally classified sample in the diagonal, while the misclassification of each different class outside the diagonal. The right matrix, instead, shows how clean the traditionally classified sample is on the diagonal, and how much is contaminated by objects belonging to different classes outside of the diagonal.