The published key uses the coefficient referenced to zero Celsius: R(T)=R₀(1+α₀T). The slope is (60−50)/(75−25)=.2 Ω/°C, giving R₀=50−.2×25=45 Ω. Thus α₀=.2/45=.00444444 °C⁻¹ and x=44.44. A coefficient referenced to twenty-five Celsius would differ; the official interpretation uses zero.
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