If $H:\frac{x^2}{16}-<!--\; -\; -->\frac{y^2}{9}=1$ and $E:\frac{x^2}{a^2}+\frac{y^2}{b^2}=1(a>b).$ Ellipse passes through the foci of the hyperbola and e₁. e₂ = 1 (where e₁, e₂ are the eccentricities of hyperbola and ellipse, respectively). The length of the chord of ellipse passing through (0, 2) is equal to