2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/1092We combine the two balloon experiments BOOMERANG and MAXIMA-1 with our previous fit which used 9 constraints and concluded that the Universe is flat. The result is that the flatness is robust, $Ω_0 = 0.97 \pm 0.05$.3 pages, no figures, LaTeX2eAstrophysicstext