Anyone understand the Cacti graphs? I've read the manual but it's still a bit confusing to me.

In Cacti I've downloaded the daily 5 minute interval CSV. Am I right in thinking that the peak inbound is the highest we're downloading at any one time and the peak outbound is the highest we're uploading?

For example our peak is 11875972.19 bits which equates to 11.876 Mb. Sounds about right so I guess I am understanding it correctly?