Add multiples scales on Y axis

[pyrog]

In order to compare i.e. emergency=defibrillator (main tag) and i.e. ref:FR:GeoDAE (sub tag), it would be nice to select i.e. left or right Y axis (each one having it's own scale).

http://taghistory.raifer.tech/#***/ref:FR:GeoDAE/&***/emergency/defibrillator

[matkoniecz]

This type of graph with multiple scales is confusing and misleading and it is basically never a proper way to present data.