Giro Mountain Stages
I was looking at the mountain stages for the Giro:
I see they have color codes for the mountains. I see a lot of green 'GPM' labels on the mountains, for example.
Does anyone know what the codes mean? Is green a 'CAT 1'? Are there whites for a 'CAT 3' or 'CAT 4'?
If anyone knows, or knows of page where it's all explained, please let me know! Thanks!