Quick question about units upgrade path

[Jabulani]

I've googled a bit to no avail, I just found Excel sheets, could you please point me to a graphic chart of units upgrade ?

Thanks in advance

 

[Olleus]

Not sure a chart is super useful, it's completely linear. Each row in this table here (except from the very last one) is an upgrade path
http://civilization.wikia.com/wiki/Units_(Civ6)