Statistical probability of the Null hypothesis validity over the redshift range 0.005 − 0.158. The Null hypothesis is the emission model with Galactic absorption, which is compared to the WHIM hypothesis, i.e., a model including a redshifted hot (T = 10⁶⁻⁷ K) CIE absorption component. The dashed black line marks the commonly adopted Null hypothesis rejection limit, p = 0.05. The FUV redshifts listed in Table 1 are shown together with the non-significant O VI doublet detections (from Table 4 in Tilton et al. 2012). The shaded color marks the confusion region of the redshifted absorption component with the Galactic hot halo.