  Two phase picture is a simple and effective methodology to capture the
nonequilibrium dynamics of polymer associated with tension propagation. When
applying it to the driven translocation process, there is a point to be noted,
as briefly discussed in our recent article [Phys. Rev. E 85, 061803 (2012)]. In
this article, we address this issue in detail and modify our previous
prediction [Euro. Phys. J. E 34, 135 (2011)] by adopting an alternative
steady-state ansatz. The modified scaling prediction turns out to be the same
as that of the iso-flux model recently proposed by Rowghanian and Grosberg [J.
Phys. Chem. B 115, 14127-14135 (2011)].
