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Experimental results of the soft x-ray spectra investigation from a hot plasma produced by impulse discharge of a dense plasma focus in pure neon are presented. The spectral-energy characteristics of x-ray emission were measured in the photon energy range of (0.55.0) keV with the help of thin absorber filters set and silicon semiconductor pi-n detectors SPPDII-04. A study was made at the filling gas pressure PNe=(2.0-6.0) Torr and at the stored capacitor bank energy W=(15-21) kJ. High degree of monochromatization for the soft x-ray emission (-90 %) was obtained. According to the experimental data characteristic plasma electron temperature in the time duration of x-ray pulse zYn=( 10-100) ns has been estimated as Te-The plasma parameters obtained are compared with the results of computer simulation of the emission process.