Explaination of Appfog's 10mb of RAM MongoDB and Redis instances?

Explaination of Appfog's 10mb of RAM MongoDB and Redis instances?

On their pricing page, under full details, every plan has MongoDB and
Redis listed as having 10mb RAM. Does this mean I cannot exceed 10mb worth
of data in MongoDB and Redis databases? Or do they share the total 2GB RAM
that's available in my plan?
Source: https://www.appfog.com/pricing/