  We compare theoretically the tripartite entanglement available from the use
of three concurrent $\chi^{(2)}$ nonlinearities and three independent squeezed
states mixed on beamsplitters, using the van Loock-Furusawa inequalities. We
also define three-mode generalisations of the Einstein-Podolsky-Rosen paradox
which are an alternative for demonstrating the inseparability of the density
matrix.
