help understand this code.

$data = (RRDs::fetch($rrd, 'AVERAGE', '-s', parsedate('last month')))[3];

This is from the cricket-95.pl script. I know that rrd fetch returns pointers to pointers or something... but im really interested to know what AVERAGE here means - is it the average of the RRD database array?
My rrd file is less than a month old and so i wonder if that's the reason i am getting the 95th %lile reading(around 3Mbps) way lower than the average interface usage reading (around 60 Mbps)




       
---------------------------------
Sick sense of humor? Visit Yahoo! TV's Comedy with an Edge to see what's on, when. 
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/