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The frequency-independent RMS temperature fluctuations determined from the COBE DMR two year sky maps are used to infer the normalization, $Q_{rms-PS}$, for models of primordial cosmological temperature anisotropy. A \lq cross'-RMS statistic is used to determine $Q_{rms-PS}$ for a forced fit to a scale-invariant Harrison-Zel'dovich ($n$ = 1) spectral model. The joint analysis of $7\deg$ and $10\deg$ RMS temperature anisotropy derived from the 53 and 90 GHz sky maps yields $Q_{rms-PS}$ = 17.0$^{+2.5}_{-2.1}$ $\mu$K when the low quadrupole is included, and $Q_{rms-PS}$ = 19.4$^{+2.3}_{-2.1}$ $\mu$K excluding the quadrupole. The effect of the low quadrupole derived from the COBE DMR data on the inferred $Q_{rms-PS}$ normalization is investigated. A bias to lower $Q_{rms-PS}$ is found when the quadrupole is included. The higher normalization for a forced $n$ = 1 fit is then favored by the cross-RMS technique. The $Q_{rms-PS}$ normalization derived for other cosmological models (CDM etc. ) is reported.
The National Aeronautics and Space Administration/Goddard Space Flight Center (NASA/GSFC) is responsible for the design, development, and operation of the Cosmic Background Explorer (COBE ). Scientific guidance is provided by the COBE Science Working Group.
