Fig 6. Feature selection by the filter method after Feature Concatenation in the VMR datasets.

(A–B) Volcano plots showing features from the light-on VMR dataset matricized by Concat3Dist and Concat9Meas, respectively. (C–D) Volcano plots showing features selected from the light-off VMR dataset matricized by Concat3Dist and Concat9Meas, respectively. The features were selected using the same filter method and cutoffs as in Fig 5. The features were also labeled in the same style as in Fig 5.