(a) The blue-solid curve is the optical conductivity of SrMnSb₂ at 7 K in the 0 cm⁻¹–1500 cm⁻¹ range. The black-dashed curve through the data is the fit which is decomposed into a narrow (magenta) and a broad (purple) Drude terms. The inset is the comparison of the measured dc resistivity (solid curve) with the inverse of the zero-frequency conductivity by fitting σ 1 ( ω ) (red circles). Panels (b) and (c) portray the plasma frequency Ω_p and scattering rate 1/τ for the two Drude components as a function of temperature.