Figure 2.

(A) The cluster plot presented in Cartesian coordinates. The x-axis is the normalized intensity for allele A. The y-axis is the normalized intensity for allele B. (B) The same cluster plot presented in polar coordinates. The x-axis is the normalized θ, which is computed as$\mathrm{\theta }=\frac{2}{\pi }\mathrm{a}\mathrm{r}\mathrm{c}\mathrm{t}\mathrm{a}\mathrm{n}\left(\frac{1}{AB}\right)$. The y-axis is the normalized$R$, which is computed as $R=A+B$. In both plots, the red cluster (Left in A and Right in B) denotes the AA genotype, the purple cluster (middle) denotes the AB genotype and the blue cluster (Left in A and Right in B) denotes the BB cluster. The samples in between clusters (black) were not assigned a genotype. A colour version of this figure is available at BIB online: https://academic.oup.com/bib.