opucem is hosted by Hepforge, IPPP Durham

Since OPUCEM is just a library, we don't have real screenshots. However, here are a few plots that were obtained using OPUCEM.

Difference between the masses of 4th generation fermions, allowed by EW precision data
Difference between the masses of 4th generation fermions for 6 different values of the SM Higgs-boson mass. (This is a large gif file, if you don't see the animation, please wait for it to load.) Probability is calculated as prob(delta chi2) from the best fit to the 2009 EW precision data by LEP EWWG. The effects of possible mixing of the 4th generation with other generations is not considered. The sum of the masses of the new quarks is taken to be 600 GeV - likewise also for the new leptons.
Higgs mass vs. mixing between 3rd and 4th generation quarks, allowed by EW precision data
The mass of the Higgs boson vs. the mixing angle (|sin θ_34|) between the 3rd and 4th generation quarks. Probability is calculated as prob(delta chi2) from the best fit to the 2009 EW precision data by LEP EWWG. The various 4th generation fermion masses are taken as: m(e4)=145, m(ν4)=100, m(u4)=500, m(d4)=445 GeV. This plot can be compared to fig.2 of Chanowitz, PRD 79, 113008 (2009) [arXiv:0904.3570].