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Toroidal tearing-mode stability code for an aspect-ratio expanded tokamak equilibrium. Code calculates the inhomogeneous toroidal tearing-mode dispersion relation. The plasma equilibrium can have an outer boundary of general shape, and is characterized by a normalized pressure profile and a lowest-order (cylindrical) safety-factor profile. The resonant magnetic perturbation coil set consists of a set of toroidal strands of negligible cross-section each carrying a current that varies harmonically with the toroidal angle.