The exact Alligator settings are:
Blueline EMA 25-8 of h+l/2
Redline EMA 15-5 of h+l/2
Greenline EMA 9-3 of h+l/2
of course this is a indicator piece of a whole method
which i believe is the best trend following i've seen
so far...but you have to know when and where to apply it.