All Figures

	Figure 1: Histogram showing our source classification segmented into the original categories.
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In the text

	Figure 2: Histograms of the maximum value of fractional variability index for a) the original classification from the literature and b) our classification.
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In the text

	Figure 3: Radio spectra of the previously identified inverted-spectrum sources.
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In the text

	Figure 4: Radio spectra of the previously identified inverted-spectrum sources.
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In the text

	Figure 5: Radio spectra of the previously identified inverted-spectrum sources.
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In the text

	Figure 6: Radio spectra of the previously identified inverted-spectrum sources.
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In the text

	Figure 7: Radio spectra of the candidate inverted-spectrum sources.
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In the text

	Figure 8: Radio spectra of the candidate inverted-spectrum sources.
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In the text

Figure 9: Semisimultaneous spectra of two different types of sources: B0743-006, which has low variability and the shape of the spectrum does not depend on the state of activity; and B0528+134, which has a clearly inverted spectral shape in the active phase but rather flat in more quiescent phases. For B0528+134, epoch 1992.10-1992.16, two separate fits have been combined in order to better model the shape of the spectrum (solid line).

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In the text