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The AIC criterion is a widely used method for estimating the number of sources in a given data set. To perform this estimation, a MATLAB source code is often utilized. However, there are several other criteria that can be used for this purpose, such as the Bayesian Information Criterion (BIC) and the Minimum Description Length (MDL) criterion. Additionally, it is important to note that the choice of criterion may depend on the specific application and the nature of the data being analyzed. Therefore, it is recommended to carefully consider the available options and select the criterion that is most appropriate for the given task at hand.