  We have refined the analysis of the data from the FIRAS (Far InfraRed
Absolute Spectrophotometer) on board the COBE (COsmic Background Explorer). The
FIRAS measures the difference between the cosmic microwave background and a
precise blackbody spectrum. We find new tighter upper limits on general
deviations from a blackbody spectrum. The RMS deviations are less than 50 parts
per million of the peak of the CMBR. For the Comptonization and chemical
potential we find $|y| < 15\times10^{-6}$ and $|\mu| < 9\times10^{-5}$ (95\%
CL). There are also refinements in the absolute temperature, 2.728 $\pm$ 0.004
K (95\% CL), and dipole direction, $(\ell,b)=(264.14^\circ\pm0.30,
48.26^\circ\pm0.30)$ (95\% CL), and amplitude, $3.372 \pm 0.007$ mK (95\% CL).
All of these results agree with our previous publications.
