Figure 2: $Δχ2=χ2-χmin2$ as a function of Higgs boson mass $mH$. The solid line is the result of the fit, and the blue band represents an estimate of the theoretical error due to missing higher order corrections. The red dashed curve is the result obtained using an alternative evaluation of $Δαhad5$, the hadronic contribution to the photon vacuum polarization. The magenta dotted curve corresponds to a fit including low-$Q2$ data, such as neutrino-nucleon scattering. The yellow shaded regions indicate the exclusion regions from direct searches at LEP and the Tevatron. (From Ref. [11].)