The number of backlinks. 

This is the number of incoming links from each referrer page.

The type of each backlink. 

A backlink can be either a text link or an image link.

Total number of outbound links (links leading offsite) for each referrer page. 

The number of outbound links can be useful to show the link relevance. Let's say that you have one referrer with 3 outbound links of which one of them links to you and some another referrer that has 100 outbound links and one of them links to you. The relevance of the first backlink is much higher than the second one due to the high number of links leading offsite from the second referrer.

The "No Follow" status of every backlink. 

This is a very important piece of information. The links that have this status set to "Yes" are ignored by the search engines when they crawl that referrer web page, hence it will not be taken into account in search engine ranking calculations.