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Table 3 The main polarization experiments, their typical observational frequencies, and the upper limits on the B-mode polarization are illustrated.

From: Stochastic backgrounds of relic gravitons: a theoretical appraisal

Experiments Years Pivot frequencies Upper limits on BB
Dasi [2426] 2000-2003 26-36 GHz (2π) ≤ 50(μK)2
Boomerang [168] 2003 145 GHz /(2π) ≤ 8.6(μK)2
Maxipol [169, 170] 2003 140 GHz /(2π) ≤ 112.3(μK)2
Quad [3133] 2007 100/150 GHz /(2π) ≤ 10(μK)2
Cbi [29, 30] 2002-2005 26-36 GHz /(2π) ≤ 3.76(μK)2
Capmap [27, 28] 2004-2005 35-46/84-100 GHz /(2π) ≤ 4.8(μK)2
Wmap [3, 4, 6] 2001-2006 23-94 GHz /(2π) ≤ 0.5(μK)2