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The CMB anisotropy at $\ell\lsim 60$ seems to have some special features which include (i) a dipole modulation and (ii) a decrease in power.
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2008
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2009
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C. M. Hirata, “Constraints on cosmic hemispherical power anomalies from quasars,” JCAP 0909
2009
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2013
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D. H. Lyth, “The CMB modulation from inflation,” JCAP 1308
2013
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2013
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2013
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2010
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2010
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2011
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2013
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S. Flender and S. Hotchkiss, “The small scale power asymmetry in the cosmic microwave background,” JCAP 1309
2013
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2013
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2013
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2014
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