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The supermirror is composed of depth-graded NiC\/Ti multilayers and functions as a reflector for grazing-incidence neutrons. Two mirror pairs consisting of precise elliptical supermirrors with diamond-machined and polished Ni\u2013P-plated Al\u2013Si alloy substrates were fabricated. Thermal deformation is minimized by this Al\u2013Si alloy, which has a thermal expansion coefficient similar to that of Ni\u2013P. The focusing performance was evaluated using the SOFIA neutron reflectometer located at BL16, Materials and Life Science Experimental Facility, Japan Proton Accelerator Research Complex. The experimental results confirmed that the two neutron beams converged to a single spot with a full width at half-maximum of 0.26\u2005mm. 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