  After 10 years of operations of the Large Area Telescope (LAT), a high-energy
pair-creation telescope onboard the Fermi satellite, the Fermi Collaboration
has produced two major catalogs: the 4FGL and the 3FHL. These catalogs
represent the best sample of potential very high energy (VHE) emitters that may
be studied by Imaging Atmospheric Cherenkov Telescopes (IACTs). Several methods
are used to extrapolate the Fermi-LAT spectra to TeV energies, generally using
simple analytical functions. The recent success of IACTs has motivated the
creation of catalogs listing the discoveries of these experiments. Among these
initiatives, gamma-cat excels as an open-access tool to archive high-level
results in the VHE field, such as catalogs, spectra and light curves. By using
these resources, we present a data-driven methodology to test the reliability
of different VHE extrapolation schemes used in the literature and evaluate
their accuracy reproducing real VHE observations.
