  TUnfold is a tool for correcting migration and background effects in high
energy physics for multi-dimensional distributions. It is based on a least
square fit with Tikhonov regularisation and an optional area constraint. For
determining the strength of the regularisation parameter, the L-curve method
and scans of global correlation coefficients are implemented. The algorithm
supports background subtraction and error propagation of statistical and
systematic uncertainties, in particular those originating from limited
knowledge of the response matrix. The program is interfaced to the ROOT
analysis framework.
