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The first measurements of the opacity in a well characterized, hot, dense, laser-produced plasma are reported. Measurements of the absorption of x rays by l to 2 transitions in Alxit through Alviit have been made in a laser heated slab plasma at the measured temperature and density of 58+ 4 eV and 0.020 0.007 g/cm . The conditions in the plasma were determined to be reproducible, spatially uniform, and in nearly complete local thermodynamic equilibrium.The absorption spectra and the temperature-density data obtained provide an improved means for comparison with detailed atomic physics and opacity calculations.