Emission spectra of PKS 2155−304. The TeV data are observed in 2006 July (MJD 53,944) and 2003 July. The data of MJD 53,944 (open squares) and those of 2003 July are corrected for absorption by EBL. The thick dashed line is X‐ray data for 2006 July observed by Swift. Other X‐ray data are obtained by BeppoSAX, which are not simultaneous with the TeV data. Model A is shown by a solid line, and a model for 2003 is shown by a dashed line.