Fig. 1
From: Identification of novel genetic regions associated with resistance to European canker in apple
Correlation matrix and principal component analysis (PCA) of phenotypic susceptibility data to European canker in a multiparental population of apple. a Correlation matrix showing Pearson’s correlation coefficient of phenotype data. b PCA biplot for the first and second component. The length of the arrows approximates the variance of the variables, whereas the angles between them (cosine) approximate their correlations