Sure, no problem here is the Metastock-Formula:
Alligator Blue:
Ref(Wilders(MP(),13),-8)
Alligator Red:
Ref(Wilders(MP(),8),-5)
Alligator Green:
Ref(Wilders(MP(),5),-3)
MP(): Returns the midpoint of the Data Array over the specified time period. The midpoint is the value halfway...