+ * \a this array, which contains 6 components. The 6 components of tuples are expected to be stored as follow :<br>
+ * \a tuple[0] = \c matrix_XX <br>
+ * \a tuple[1] = \c matrix_YY <br>
+ * \a tuple[2] = \c matrix_ZZ <br>
+ * \a tuple[3] = \c matrix_XY <br>
+ * \a tuple[4] = \c matrix_YZ <br>
+ * \a tuple[5] = \c matrix_XZ <br>