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The absorption of gamma-rays in the intergalactic medium due to the EBL(Extragalactic Background Light) causes the observed blazar spectrum to befainter and softer than their intrinsic state. It could thus be expected to seean effective spectral-softening trend with redshift. No such trend is evidentin the sample of VHE blazars currently observed.  To check which distributions of the properties of the parent blazarpopulation could reproduce the observations, various simulations are done. Theresulting subsamples that satisfy a generic detection criterion for the currentgeneration of ACTs (Atmospheric Cherenkov Telescope) are checked to identifywhether any inherent correlations (of spectral properties with redshift) arerequired to explain the current observations.

Spectral trends in the Very High Energy blazar sample due to EBL absorption