Table 1: Average parameters for different classes of sources proposed in this paper. For the classification criteria, see Sect. 3.
Proposed N z $\nu_{\rm peak, OBS}$ $\nu_{\rm peak, REST}$ 1 $\alpha_{\rm below}$ $\alpha_{\rm above}$ Var $_{\Delta S}$ Mode of $\nu_{{\rm Var}_{\Delta S,\rm MAX}}$
class Sources   GHz GHz   max GHz  
gps 29 0.59 2.77 3.86 +0.91 -0.88 1.21 36.7
n 28 0.40 1.53 2.82 +0.78 -0.91 0.52 0.4
s 11 0.37 0.36 0.50 - -0.84 0.78 4.3
f 7 1.07 2.01 4.54 +0.36 -0.34 1.50 4.3
f/s 16 0.78 0.35 0.61 +0.29 -0.90 0.86 4.3
c 5 0.42 2.16 3.10 +1.15 -0.95 3.34 36.7
all 96 0.58 1.65 2.77 +0.82 -0.86 1.04 4.3
1 Calculated when z available; gps = Gigahertz-peaked spectrum; n = Not enough data for GPS identification; s = Steep spectrum; f = Flat spectrum; f/s = Flat at low frequencies, steep at high frequencies; c = Convex (and variable) spectrum.

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