cosmology - In the B mode power spectrum, what is the relationship

One of the key datasets of the recent BICEP2 results is the B mode power spectrum shown below. The existence of these B modes implies the existence of gravitational waves prior to inflation. My

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The first season Polarbear B-mode power spectrum (The Polarbear

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B-mode of the ultrasound Download Scientific Diagram

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A duplex ultrasound output displaying the B-mode and colour flow