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We introduce a multi-mode squeezing coefficient to characterize entanglement in N -partite continuous-variable systems. The coefficient relates to the squeezing of collective observables in the 2N -dimensional phase space and can be readily extracted from the covariance matrix. Simple extensions further permit to reveal entanglement within specific partitions of a multipartite system. Applications with nonlinear observables allow for the detection of non-Gaussian entanglement.
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