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  For the synchrotron component of blazar spectra, 
  the low-frequency spectral break due to synchrotron 
  self-absorption moves to higher frequencies as one 
  measures closer to the base of the jet [2]. This of- 
  ten places the peak of the spectrum in the millime- 
  ter and submillimeter bands, where the emission is 
  optically-thin and originates on parsec and sub-parsec 
  scales [3], allowing direct observation of the most com- 
  pact regions near the central engine. The high en- 
  ergy γ-ray emission originates as a Compton process, 
  typically a combination of synchrotron-self-Compton 
  (SSC) and external-radiation-Compton (ERC). De- 
  pending on the source properties, the synchrotron 
  photons or external photons are upscattered by the 
  same population of electrons that emit the millimeter 
  and submillimeter spectra. Therefore the submillime- 
  ter and γ-ray emission are closely linked and give the 
  full information about the source emission. 