Closed:What is the reason for deviation from diagonal?

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I draw a ggplot for my data (I have some data about common SNPs between DNA and RNA data, both DNA and RNA file are for one population and I find same position between DNA and RNA, then I calculate the Alternative allele frequency for same SNPs in each DNA and RNA files and finally draw plot for it). As you see I have a deviation from the diagonal to right side of plot. I would like to know the deviation from diagonal?