Table 4. Confusion matrix considering the classification of the principal Phee class into sub-classes using OPF with Euclidean distance metric and 90% of the samples for training set.

		True class[%]
		Phee-2	Phee-3	Phee-4
Classified as[%]	Phee-2	70.4	19.8	9.7
	Phee-3	14.8	46.2	39.1
	Phee-4	14.8	34.0	51.2