Fig. 2From: Analysis of exhaled breath fingerprints and volatile organic compounds in COPDPlot of the first two latent variables (LV) of the PLS-DA classifier. Each point is one measured sample. Even if the complete cross-validated model contains 3 latent variables the plot of the first two variables provides a simple visualization of the electronic nose capability to separate healthy and COPD group. LV = latent variableBack to article page