I have this bi-plot PCA in my manuscript. I submitted this manuscript in a journal and now one of the reviewers has said “the authors do not identify clearly what are the PC1 and PC2 components”. I really couldn’t figure out if the reviewer means the PC1 and PC2 which are on axes x and y?! If so, I have never seen any literature to explain the axes and always the programs give us PCA figures with x and y axes showing PC1 on axis x and PC2 on axis y and a number in %. Or I’m wondering maybe the reviewer means to identify graphic 1 and graphic 2 of this figure. Could you please let me know your thoughts about this question regarding this figure?
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