The Degree Angular Scale Interferometer ( DASI ) has measured the power spectrum of the Cosmic Microwave Background anisotropy over the range of spherical harmonic multipoles 100 < l < 900 .
We compare this data , in combination with the COBE-DMR results , to a seven dimensional grid of adiabatic CDM models .
Adopting the priors h > 0.45 and 0.0 \leq \tau _ { c } \leq 0.4 , we find that the total density of the Universe \Omega _ { tot } = 1.04 \pm 0.06 , and the spectral index of the initial scalar fluctuations n _ { s } = 1.01 ^ { +0.08 } _ { -0.06 } , in accordance with the predictions of inflationary theory .
In addition we find that the physical density of baryons \Omega _ { b } h ^ { 2 } = 0.022 ^ { +0.004 } _ { -0.003 } , and the physical density of cold dark matter \Omega _ { cdm } h ^ { 2 } = 0.14 \pm 0.04 .
This value of \Omega _ { b } h ^ { 2 } is consistent with that derived from measurements of the primeval deuterium abundance combined with big bang nucleosynthesis theory .
Using the result of the HST Key Project , h = 0.72 \pm 0.08 , we find that \Omega _ { tot } = 1.00 \pm 0.04 , the matter density \Omega _ { m } = 0.40 \pm 0.15 , and the vacuum energy density \Omega _ { \Lambda } = 0.60 \pm 0.15 .
( All 68 % confidence limits . )