[NTG-context] statistical charts (was: Changing the colors of Charts in luametafun)

Hi all, I play around with the charts module by Tamara Kocurová & Adriana Kašparová. Great work! I really like it. https://akela.mendelu.cz/~thala/statcharts/ There is one very nitpicking thing. The dots of the grid are not always in a regularly fixed distance as the attached screenshot shows. I am not sure if this can be solved with a customized configuration. Ciao! juh