Moving the vertical guide to the right so it's easier to read is often met with horror by graph traditionalists... #bivi2017pic.twitter.com/85ZtANY5jn
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I do that already but I had no idea about such a rule — thanks for sharing will bear in mind.
I helped organise a workshop on data viz. 
I would very heartily recommend attending or hosting a session with Jean-Luc Doumont - http://www.principiae.be/ - it's been so informative!
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