We have investigated electronic transport in graphene nanoribbon devices with
additional bar-shaped extensions ("wings") at each side of the device. We find
that the Coulomb-blockade dominated transport found in conventional ribbons is
strongly modified by the presence of the extensions. States localized far away
from the central ribbon contribute significantly to transport. We discuss these
findings within the picture of multiple coupled quantum dots. Finally, we
compare the experimental results with tight-binding simulations which reproduce
the experiment both qualitatively and quantitatively
