For each collection, you can get a graph of browser hits broken down by refered searches (from search engines) and other referers.

Colored bars

1. Refering searches: Hits coming from search engines such as Google, Yahoo, Microsoft Live, Ask or more as defined in Referring Domains Tab.
2. Referers: Hits coming from other sites linking to your site/collection.

Data set

1. Live Data: Data from the hitlog table that gets updated in Real Time.
2. Aggregate Data: Data from the hitlog aggregate table that gets updated once per day, when the scheduled Task Prune old hits & sessions (includes OPTIMIZE).

Comparison

The second graph offers a visual comparison of the latest hits (top graph) with a previous period (bottom graph)