Extended Data Fig. 5: Temperature estimates from relationships with the 660-discontinuity topography.

Grey line is the Clapeyron slope of −2.5 MPa M⁻¹ (ref. ⁸²). Symbols represent average estimates from the Mid-Atlantic Ridge⁸³, northwest Africa⁸⁴, Southwest Indian Ridge⁸⁵ and Hawaii⁸⁶.