Fig. 6
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T-ϕ. Constraints on the (left) GW speed v and (middle) scalar- to-tensor fraction r2 for scalar and tensor modes in the SGWB using the NANOGrav (Agazie et al. 2023b) (black dots) and CPTA (Xu et al. 2023) (green crosses) correlations data. (Right) Best-fit correlation samples (red curve with 1σ bands) corresponding to the left and middle panels. The HD curve (gray dashed) is shown for reference.
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