This is illustrated in previous posts in the same thread:
http://neuroimage.usc.edu/forums/showthread.php?1796-How-the-Corr-matix-is-saved&p=7616#post7616
Other related discussions:
http://neuroimage.usc.edu/forums/showthread.php?1681-PLV-NxN-Read-matrix
http://neuroimage.usc.edu/forums/showthread.php?1556