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B. Mason (Caltech), CBI Collaboration
We present a determination of the microwave background intrinsic anisotropy spectrum over the range L=500 to L=4000 derived from very deep observations of three pairs of fields with the Cosmic Background Imager (CBI). The CBI is a 13-element interferometer operating in the frequency range from 26 to 36 GHz at a site in the high Chilean Andes. Our results confirm earlier findings of a drop in the CMB power spectrum, and show that this continues to high L.