Table 3
Average spectral indices for BZCat and 3LAC source classes.
| Sample | Class | ⟨αlow⟩ ± σ⟨αlow⟩ | ⟨α0.18−1⟩ ± σ⟨α0.18−1⟩ | n low, 0.18−1 | ⟨α1−20⟩ ± σ⟨α1−20⟩ | n 1−20 |
| (1) | (2) | (3) | (4) | (5) | ||
|
|
||||||
| BZCat-MWACS | Total | 0.57 ± 0.02 | 0.337 ± 0.013 | 186 | 0.096 ± 0.004 | 170 |
| FSRQ | 0.56 ± 0.02 | 0.297 ± 0.014 | 147 | 0.097 ± 0.005 | 139 | |
| BLL | 0.49 ± 0.05 | 0.46 ± 0.03 | 23 | 0.105 ± 0.014 | 18 | |
|
|
||||||
| 3LAC-MWACS | Total | 0.50 ± 0.03 | 0.305 ± 0.017 | 87 | 0.074 ± 0.005 | 81 |
| FSRQ | 0.49 ± 0.04 | 0.18 ± 0.02 | 52 | 0.038 ± 0.006 | 52 | |
| BLL | 0.42 ± 0.06 | 0.39 ± 0.04 | 19 | 0.138 ± 0.012 | 17 | |
Notes. For each set, we report the weighted average and the error on the weighted average. Weights wi on each spectral index αi are determined as 1 /σi, where σi is the uncertainty on the spectral index as provided in the MWACS catalogue at low frequency, or is determined through propagation of the uncertainty on the measured flux density for α0.18−1 and α1−20. The weighted average is then 
and the associated error is 
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