text: J1751+096) which have conﬂicting classiﬁcations be- 
  tween Fermi and CGRaBS. Some blazars found in the 
  calibrator list have been studied extensively (e.g., 3C 
  279 and 3C 454.3) but the SMA blazars have not been 
  studied collectively. 
  
  Figure 2: Variability index for our sample (top: 1mm, 
  bottom: 850µm), with FSRQs as the hatched 
  distribution and BL Lacs as the solid distribution. There 
  is no signicant diﬀerence in the class distributions in 
  either band; the “tail” to the left is populated by objects 
  with errors larger than the intrinsic variability. 
  
  Forty-four of the objects in our total blazar sample 
  were detected by Fermi and can be found in the cata- 
  log of LAT Bright AGN Sources (LBAS) from Abdo et 
  al. [7]. J0050-094 has no redshift in either the LBAS 
  catalog or CGRaBS and is not included in our study. 
  Of the 43 remaining sources, 14 are BL Lac objects 
  and 29 are FSRQs, with 0.03 ≤ z ≤ 2.19. 