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We study the spectral edges and operator norm of $H_M = A_0\\otimes I_M + \\frac{1}{\\sqrt{M}}\\sum_{i=1}^n A_i\\otimes G_i$. Lehner's formula identifies the right and left edges of the corresponding free semicircular operator as $\\rho_+ = \\inf_{Z\\succ 0}\\lambda_{\\max}(A_0+Z+\\sum_{i=1}^n A_iZ^{-1}A_i)$ and $\\rho_- = \\sup_{Z\\prec 0}\\lambda_{\\min}(A_0+Z+\\sum_{i=1}^n A_iZ^{-1}A_i)$. 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