<b class="info_field">Modifications: </b> <br>
 19-sep-2003, VF<br>
 17-Feb-2003, VF<br>
 24. 6.00 V. Hlavac, comments polished.<br>
 11-dec-2000 V. Franc, a little increasing of code readibility<br>
 15-dec-2000<br>

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