Study the diagram about the varying pressures of Earth’s Layers.

Earth apostrophe s layers. The Crust at depth of 0 kilometers, upper mantle depth 410 kilometers, lower mantle depth 2,900 kilometers at 125 gigapascals, 2,200 degrees Celsius. Outer core depth 5,100 kilometers at 330 gigapascals, 5,000 degrees Celsius. Inner core at 364 gigapascals, 5,500 degrees Celsius.

Which is the best estimated pressure, represented in units of GPa, of the lower mantle?