If one of the diameters of the curve $x^{2} + y^{2} - 4x - 6y + 9 = 0$ is a chord of a circle with centre $(1, 1)$, the radius of this circle is
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If one of the diameters of the curve $x^{2} + y^{2} - 4x - 6y + 9 = 0$ is a chord of a circle with centre $(1, 1)$, the radius of this circle is