We present spectral energy distributions for 18 stars intended as flux standards for large southern hemisphere telescopes. The monochromatic magnitudes range between 10 and 14.5 and the wavelengths observed are from λ 3200 to λ 8280. We also present mean narrow-band extinction coefficents for Cerro Tololo over the wavelength range λλ 3200–8370.
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Stone et al. (1983) studied this question.