Nutriscore graphing colours

[aleene]

What

When make a graph with the colours of the corresponding Nutriscore, the colours used a a bit strange.

Steps to reproduce the behaviour

see https://world.openfoodfacts.org/cgi/search.pl?action=process&tagtype_0=categories&tag_contains_0=contains&tag_0=walnuts&sort_by=unique_scans_n&page_size=20&axis_x=energy&axis_y=proteins&graph_title=Nutroscore%20colours&series_nutrition_grades=on&graph=1

Expected behaviour

Colours that match the official Nutriscore colours

Why

Less confusion