  A very simple method for determining the center (isomer) shift, CS, of a
M\"ossbauer spectrum is outlined. Its applicability is demonstrated on two
examples viz. pyrite and a ternary sigma-phase Fe-Cr-Ni compound. Sets of the
spectra recorded in the temperature interval of 78-295 K for the former, and
5-293 K for the latter were analyzed with the simple and a commonly used
methods. CS(T)-values obtained with both ways of the fitting procedures were
analyzed in terms of the Debye model. The determined therefrom values of the
Debye temperatures agree within the error limit with each other proving thereby
that this very simple method gives correct values of CS.
