In this proceeding, we explain a few steps for an alternative extraction of
the spectral density of a two-point function (propagator) based on a discrete
set of data points. We present a so-called Tikhonov regularization of this
particular inverse problem. We test it on 2 cases: lattice 0++} glueball data
and mock gluon data.Comment: 8 pages, 4 figures. Proceedings of Xth Quark Confinement and the
Hadron Spectrum, October 8-12, 2012, TUM Campus Garching, Munich, German