http://geoflop.uchicago.edu/cgi-bin/modtran3a.cgi?pco2=375&ch4=1.7&trop_o3=28&strat_o3=1&Toffset=0&h2otscaled=0&h2orat=1&model=3&icld=0&altitude=1&i_obs=180&runlabel=your_name_here&i_save=0