Fig. 2
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Subluminal GWs. Left panel: constraints on the GW speed v for tensor modes using the NANOGrav (Agazie et al. 2023b) (black dots) and CPTA (Xu et al. 2023) (green crosses) correlations data. Right panel: best-fit correlation samples (red curve with 1σ bands) corresponding to the left panel. The HD curve (gray dashed line) is shown for reference.
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