A covariance biplot (GE-Biplot) using the same set of selected genes. The genes are shown as tilde, marking their positions relative to the chip points which are shown as numerals indicating the time in minutes, with colors corresponding to the cell phases as determined by Cho et al. The genes in this plot have the same coordinates as in Figure 3. The chips allocated to the differently colored phases appear in the same region and have been joined by a dashed line in time-sequence. The spiral shape of the dashed line confirms that these genes do overall follow a cyclic pattern. I1 and I2 shown in the title, are two fit indices with a maximum value of 1, described in methods.