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Due to an error in reporting the spectral parameters of Mrk 421 from literature, the upper panels of Figs. 1, 2, 4, 6, 8 have a mistake. In these figures, the height of the SED at the peak energy for Mrk 421 was incorrectly reported from the literature (see Tramacere, A., Massaro, F., & Cavaliere, A., 2007, A&A, 466, 521) as being a factor of 10 lower than it’s true value. However, the conclusions and the results of the paper are not affected by the above mistake. Here in the following there are the corrected version of the above figures.

astronomy and astrophysics

X-ray spectral evolution of TeV BL Lacertae objects: eleven years of observations withBeppoSAX,XMM-NewtonandSwiftsatellites (Corrigendum)