Emanation

An emanation issues forth from each side of your space, extending out to a specified number of feet in all directions. For instance, the overload systems spell's emanation radiates 15 feet outward from the caster. Because the sides of a creature's space are the starting point for the emanation, an emanation from a Large or larger creature affects a greater overall area than that of a Medium or smaller creature. Unless the text states otherwise, the creature creating an emanation effect chooses whether the creature at its center is affected.