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such a way that a complex molecular structure and a high critical 
temperature (circumstances which are usually coexistent) cause diver- 
gence between the branches of the curve, while simple molecular 
structure and a low critical temperature appear to cause them to 
contract. 
Looked at from this point of view, it is of importance to note that 
the curves for xenon and oxygen so closely correspond that there 
appears no appreciable difference between the density curves in the 
diagram, and they have accordingly been represented by a single 
