Radio/microwave low frequency (ν < 70 GHz, LF; left side) and high frequency (ν > 70 GHz, HF; right side) spectral index distributions of FSRQs and BL Lacs in our samples for the case νBreak = 70GHz. While the distributions of low frequency spectral indices are very similar for both types of blazars with ⟨αLF⟩ ~ −0.1, the distributions of the high frequency slopes indicate that the spectra of FSRQs (⟨αHF⟩ = −0.73 ± 0.04) might be somewhat steeper than those of BL Lacs (⟨αHF⟩ = −0.51 ± 0.07). A Kolmogorov Smirnov (KS) test gives a probability of less than 3% that the HF distributions for FSRQs and BL Lacs come from the same parent distribution.
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