Figure 4

Resistance maps of the four constant-width channels studied in this paper. The colors provide a quantitative description of each system’s resistance. The dark red bands in the middle of each frame represent the resistance of the microchannel, which is far greater than the resistance in the inlet and outlet channels as seen in their lighter red color. Dark red streaks leading up to the channel correspond to brief moments when one particle was approaching or leaving the channel during another particle’s translocation, and therefore do not represent the actual resistance of that part of the channel. The gaps on the right hand side of the 15 μm channel are due to debris outside of the channel, which influenced the particles’ trajectories in this region.