Fig. 4From: A biplot correlation range for group-wise metabolite selection in mass spectrometryThis figure illustrates selected variables by the four tested methods in the following conditions: a in layer 1 of the two-layer structure when noise condition δi = 0 and level = 0.05; b in layer 2 of the three-layer structure when noise condition δi = 0 and level = 0.10Back to article page