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There is a well-measured constraint on YMCs that we can apply to predict the upper limit radii for the MPCs. Recent high resolution imagining and spectral studies of YMCs have shown these systems to be in or close to equilibrium at ages of years. (\cite {The Origin of Species Darwin_1900})  Compare: \cite{\cite{1996}Bower&Christensen \cite{Bower&Christensen  1996} I am getting a 'Missing Title' error, but I don't know where to put the title in the citation format. format.... oops it meant the Block Title...