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Thermal plasma produced by plasma torches is both a dynamic system challenging for analysis and a reactive matter with high energy density used in many industrial applications. With the help of a mirror system, we have recorded a plasma jet, produced by the experimental direct-current plasma torch, simultaneously from three directions. A tomographical reconstruction in 3-D of the evolution of plasma radiation using a previously developed method of interpolated profiles followed. Finally, we used wavelet analysis to compare the fluctuations of plasma for the different variants of gas input. Reconstructed images of plasma radiation and fluctuations are presented.