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In both graphs, the x axis should indicate progress of a reaction and the y axis should indicate the energy of a reaction. In an exothermic graph, the products are at a lower energy level than the reactants, because energy is released. In an endothermic graph, the products are at a higher energy level than the reactants because the reaction takes in energy.
But keep in mind that delta H has a lot to do with this. and when measuring delta H you would measure from the beginning to the end state. (even if it does a big loop up, its just beginning and end result)
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