Histograms of the logarithm of the Balmer lines velocity dispersion (σ) for the different classes of the agnostic-to-X-rays sample. The pink continuous and blue dashed lines show the AGNs and SFGs classified by the SB12 diagram. The SFGs based on the BPT diagram are presented with a black dashed-dotted line while the red dotted line shows those classified as SFGs by the BPT but as AGNs by the SB12 diagram.