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Diagram displaying the log of the initial cooling rate (r0) as a function of the initial temperature of the magma. Each curve illustrates the maximum r0 below which cores of spherical apatite grains, with radius of 10, 50 and 100 μm, would not retain their initial volatile content. Calculations have been made using the diffusion parameters determined at 1 atm and 1 GPa by Brenan [106].
