16 Given that the eccentricity of an ellipse is $e$, and the two foci are $F_{1}$ and $F_{2}$, the parabola $C$ has $F_{1}$ as its vertex and $F_{2}$ as its focus. Point $P$ is an intersection point of the parabola and the ellipse. If $e\left|P F_{2}\right|=\left|P F_{1}\right|$, then $e=$ $\qquad$.
(16) $\frac{\sqrt{3}}{3}$