The slope of the $I_{D}$ vs. $V_{GS}$ curve of an n-channel MOSEFT in linear regime is $10^{-3}\Omega ^{-1}$ at $V_{DS}= 0.1 \: V$. For the same device, neglecting channel length modulation, the slope of the $\sqrt{I_{D} }$ vs. $V_{GS}$ curve (in $\sqrt{A}/V$) under saturation regime is approximately _________.