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+\textbf{Loading data from files}
+
+\lstinline|loadtxt('filename')| returns the columns of file in one
+sequence.
+
+\lstinline|x, y = loadtxt('filename', unpack=True)| to obtain a file
+with 2 columns in separate sequences.
+
+\lstinline|loadtxt('filename', delimiter=';')|, if the file has
+columns separated by ';' instead of spaces/tabs.
+
+