Figure 1: The current-voltage (i-V) curves through ANT−5 and ANT−6.
From: Origin of the Shape of Current-Voltage Curve through Nanopores: A Molecular Dynamics Study

The red line is the i-V curve through ANT−5, and the black for ANT−6. The i-V curve through ANT−5 is sublinear, while that through ANT−6 is superlinear.