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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 5,396,912
<SECURITIES> 73,500
<RECEIVABLES> 1,913,661
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 7,384,073
<PP&E> 7,331,908
<DEPRECIATION> 6,246,551
<TOTAL-ASSETS> 8,469,430
<CURRENT-LIABILITIES> 80,883
<BONDS> 572,085
0
0
<COMMON> 0
<OTHER-SE> 7,816,462
<TOTAL-LIABILITY-AND-EQUITY> 8,469,430
<SALES> 0
<TOTAL-REVENUES> 1,210,860
<CGS> 0
<TOTAL-COSTS> 336,760
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 35,182
<INCOME-PRETAX> 838,918
<INCOME-TAX> 0
<INCOME-CONTINUING> 838,918
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 838,918
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>
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