. []{data-label="fig:fitting0"}](00000Fig0.eps){width="0.0\linewidth"}  ![ (Color online) Data of $l_0(t)$, $l_0(t)$, and $l_{0_+}(t)$ plotted by $\bigcirc$, $\bigtriangleup$, and $\diamondsuit$, respectively. The 