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Caption : correlation between the total experimental dehydration enthalpies, δh°<sub>exp</sub>(dehyd), of the hydrated cations m<sup>2+</sup>(aq) and the secondary sphere dehydration enthalpies, δh°1(dehyd), of the aqua cations m(h<sub>2</sub>o)<sub><i>n</i></sub><sup>2+</sup> (m = ca to zn). [data from table 7 in main text.]