Fig. 4.

(A) Score plot in the plane of the two lowest-order PCs. Samples are shown with different colours based on the sampling month. (B) Score plot in the plane of the two lowest-order PCs. Samples are differentiated on the basis of the sampling month using a chromatic scale from blue to red; 1 = January and February, 2 = December and March, 3 = November and April, 4 = October and May, 5 = September and June, 6 = August and July. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)