domain name
maximum images to show (-1 for all)
maximum image referrerrs to show (-1 for all)
maximum referring webpages to show (-1 for all)
maximum IP Addresses to show (-1 for all)
maximum directories (-1 for all)
maximum entries to show per item (-1 for all)

Consider all maximums to be -1
Exclude popular search engines among referrals
Extended Log Format .additional property is subdirectory