Powermax snapshot space utilisation

I have a customer who is using SnapVX snapshots for various storage groups. They want to know how much impact the snapshots are having on the overall capacity of the array.

I have followed the information at https://infohub.delltechnologies.com/ja-jp/l/dell-emc-powermax-and-vmax-all-flash-timefinder-snapvx-local-replication-1/snapshot-capacity-monitoring/  but I end up with 5 different figures for one storage group after running the commands in the linked article.

Which numbers should I add together to give me a single number that is the overall impact on the available space on the array?