  The two-particle correlation function employed in Hanbury-Brown Twiss
interferometry and femtoscopy is traditionally parameterized by a Gaussian
form. Other forms, however, have also been used, including the somewhat more
general L\'evy form. Here we consider a variety of effects present in realistic
femtoscopic studies which may modify the shape of the correlation function and
thereby influence the physical interpretation of a given parameterization.
