'how to correct overlaping text in base R plots

just wonder how to correct overlapping texts in base R plots. below are the code and the figure.

plot(countdata,
        col= "blue",
        main = "Before batch correction",
        cex = 1.5,
        cex.lab = 2,
        cex.main = 2,
        cex.axis = 2,
        xlab = "PC1:58%",
        ylab = "PC2:6%")

enter image description here



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