ggplot2_pca: revision graph

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"planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/ggplot2 commit b9aa31ad4f99a9bbf726b78a0704ab1f68f05cea" draft
Tue, 26 Oct 2021 15:13:06 +0000, by iuc
"planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/ggplot2 commit 8e0f13edc2c06772dac0c1258e362045e68028b8" draft
Wed, 18 Nov 2020 21:33:00 +0000, by iuc

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