LOW SB, EXTRANUC regions
ngc3521 (2 enucs)
ngc4321 (1 enucs)
ngc6946 (1 enucs)
ngc0628 (1 enucs)
ngc3938 (1 enucs)
m101 (1 enucs)
m33 (2 enucs)
ngc7793 (3 enucs)
ngc4631 (1 enucs)