The broadband SEDs of Mrk 421 during the 4.5 month long multiwavelength campaign in 2009 (left) and of 1ES 1959+650 on the 2016 June 14 (right). The data and the errors are in blue, the red line is the model corresponding to the best parameters, i.e., maximizing the likelihood, and the gray spectra represent one in 10 randomly selected samples from the MCMC sampling, representing the model uncertainty. The data are corrected for EBL absorption.