SED of PKS 1424+240 constructed from radio to VHE γ rays: radio 15 GHz from OVRO (black filled circles), 30 GHz to 857 GHz from Planck (black arrows and filled circle), optical R-band from KVA (blue filled circles), optical to UV from UVOT (pink (lowest state) and purple (highest state) filled circles), X-rays from Swift-XRT (light blue (high state) and violet (low state) filled circles), HE γ rays from Fermi-LAT (red filled circles) and VHE γ rays from MAGIC (2009: black, 2010: gray, 2011: light blue). The SED is fitted with three single-zone SSC models: the high γ_min fit (solid line) and the fits that result from the χ² minimization (dashed and dot-dashed lines; see text for details). The inset shows the optical-UV range of the SED on an expanded scale. A redshift of z = 0.6 is assumed.