A diffusional mixer (Fig. 3b), without the through hole,
was used to compare performances, and shows 2 unmixed
streams at the distal end of the device (highlighted by a white
cross). When the through hole feature was added (Fig. 3c),
the mixing behavior changed and the flow divided in three
apparent streams, almost entirely mixing (single color) at the
end of the device (~80% of the channels length)