Reporters: This section shows you which organizations are sending you DMARC reports and some statistics about it.
Detailed information are: how many reports you’ve received; how many sources Ips and messages they are about and how many header From have been detected.
In DMARC Report section you can modify the time interval and domain you would analyze by using filters.
The Reporters section at the bottom gives you information like; The Reporter, reports, IP count, from domain count, and volume.