Fig. 1
Archival SEDs (νLν in erg/s as a function of the rest-frame frequency in Hz) of four iconic VHE blazars: 3C 279 in green, PKS 1424+240 in red, PG 1551+113 in yellow and Mrk 421 in blue. The SEDs have been compiled using the ASDC SED builder tool (http://tools.asdc.asi.it/SED). Among these four sources, 3C 279 is the only one that has been detected at VHE only during flaring activity.
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