Facets

Every report can have two or more Y, two X or more X, in this case we call this report faceted. Basically, it splits a chart and draws it for every variable as a facet. For example, you can create a chart that shows dynamic of cards creation by time for all your Trello boards.

What can we say about the above chart? It is clear that Subnautica Development board has more cards created during all time and Habitica board is almost dead from middle of 2016.