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The unfolding program TRUEE is a software package for the numerical solutionof inverse problems. The algorithm was first applied in the FORTRAN77 programRUN. RUN is an event-based unfolding algorithm which makes use of the Tikhonovregularization. It has been tested and compared to different unfoldingapplications and stood out with notably stable results and reliable errorestimation. TRUEE is a conversion of RUN to C++, which works within thepowerful ROOT framework. The program has been extended for moreuser-friendliness and delivers unfolding results which are identical to RUN.Beside the simplicity of the installation of the software and the generation ofgraphics, there are new functions, which facilitate the choice of unfoldingparameters and observables for the user. In this paper, we introduce the newunfolding program and present its performance by applying it to two exemplarydata sets from astroparticle physics, taken with the MAGIC telescopes and theIceCube neutrino detector, respectively.

Solving inverse problems with the unfolding program TRUEE: Examples in astroparticle physics