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We propose a method for obtaining the Schmidt decomposition of bipartitesystems with continuous variables. It approximates the modes to the prescribedaccuracy by well known orthogonal functions. We give some criteria for thecontrol of errors. We illustrate the method comparing its results with thealready published analysis for entanglement of biphotons. The agreement isexcellent.Comment: 6 pages, 4 figures, minor changes, published versio

Dealing with entanglement of continuous variables: Schmidt decomposition with discrete sets of orthogonal functions