**5.5.6. Conclusions from D/H from quasars**

Most agree that D is providing the most accurate value [11], although some have one remaining objection, that there might also be quasar absorbers which show high values of D/H [112], [7].

The D/H from our group (Burles & Tytler [97], [63], [62]), together with over 50 years of theoretical work and laboratory measurements of reaction rates, leads to the following values for cosmological parameters (unlike most errors quoted in this review, which are the usual 1 values, the following are quoted with 95% confidence intervals):

- D/H = 3.4 ± 0.5 x 10
^{-5}(measured in quasar spectra) - = 5.1 ±
0.5 x 10
^{-10}(from BBN and D/H) -
*Y*_{p}= 0.246 ± 0.0014 (from BBN and D/H) -
^{7}Li / H = 3.5^{+1.1}_{-0.9}x 10^{-10}(from BBN and D/H) - 411 photons cm
^{-3}(from the CMB temperature) -
_{b}= 3.6 ± 0.4 x 10^{-31}gcm^{-3}(from CMB and ) -
_{b}*h*^{2}= 0.019 ± 0.0024 (from the critical density_{c}) -
*N*_{}< 3.20 (from BBN, D/H and*Y*_{p}data).