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COMPASS is an on-axis 2.6 m telescope coupled to a correlation polarimeter operating at a wavelength of 1 cm. The entire instrument was built specifically for cosmic microwave background (CMB) polarization studies. We report here on observations of 2001 February-April using this system. We set an upper limit on E -mode polarized anisotropies of 1036 μK 2 (95% confidence limit) in the l range 93-555.
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Farese et al. (2004) studied this question.
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