Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: . <table class='wikitable'><tr><td>1</td><td>contractual obligations</td><td>2015</td><td>2016</td><td>2017</td><td>2018</td><td>2019</td><td>thereafter</td><td>total</td></tr><tr><td>2</td><td>long-term obligations excluding capital leases</td><td>888810</td><td>753045</td><td>700608</td><td>1787451</td><td>3159286</td><td>7188751</td><td>14477951</td></tr><tr><td>3</td><td>cash interest expense</td><td>550000</td><td>517000</td><td>485000</td><td>399000</td><td>315000</td><td>654000</td><td>2920000</td></tr><tr><td>4</td><td>capital lease payments ( including interest )</td><td>15589</td><td>14049</td><td>12905</td><td>12456</td><td>10760</td><td>173313</td><td>239072</td></tr><tr><td>5</td><td>total debt service obligations</td><td>1454399</td><td>1284094</td><td>1198513</td><td>2198907</td><td>3485046</td><td>8016064</td><td>17637023</td></tr><tr><td>6</td><td>operating lease payments ( 11 )</td><td>574438</td><td>553864</td><td>538405</td><td>519034</td><td>502847</td><td>4214600</td><td>6903188</td></tr><tr><td>7</td><td>other non-current liabilities ( 12 ) ( 13 )</td><td>11082</td><td>20480</td><td>5705</td><td>13911</td><td>4186</td><td>1860071</td><td>1915435</td></tr><tr><td>8</td><td>total</td><td>$ 2039919</td><td>$ 1858438</td><td>$ 1742623</td><td>$ 2731852</td><td>$ 3992079</td><td>$ 14090735</td><td>$ 26455646</td></tr></table> ( 1 ) represents anticipated repayment date ; final legal maturity date is march 15 , 2043 . ( 2 ) represents anticipated repayment date ; final legal maturity date is march 15 , 2048 . ( 3 ) in connection with our acquisition of mipt on october 1 , 2013 , we assumed approximately $ 1.49 billion aggregate principal amount of secured notes , $ 250.0 million of which we repaid in august 2014 . the gtp notes have anticipated repayment dates beginning june 15 , 2016 . ( 4 ) assumed in connection with our acquisition of br towers and denominated in brl . the br towers debenture amortizes through october 2023 . the br towers credit facility amortizes through january 15 , ( 5 ) assumed by us in connection with the unison acquisition , and have anticipated repayment dates of april 15 , 2017 , april 15 , 2020 and april 15 , 2020 , respectively , and a final maturity date of april 15 , 2040 . ( 6 ) denominated in mxn . ( 7 ) denominated in zar and amortizes through march 31 , 2020 . ( 8 ) denominated in cop and amortizes through april 24 , 2021 . ( 9 ) reflects balances owed to our joint venture partners in ghana and uganda . the ghana loan is denominated in ghs and the uganda loan is denominated in usd . ( 10 ) on february 11 , 2015 , we redeemed all of the outstanding 4.625% ( 4.625 % ) notes in accordance with the terms thereof . ( 11 ) includes payments under non-cancellable initial terms , as well as payments for certain renewal periods at our option , which we expect to renew because failure to renew could result in a loss of the applicable communications sites and related revenues from tenant leases . ( 12 ) primarily represents our asset retirement obligations and excludes certain other non-current liabilities included in our consolidated balance sheet , primarily our straight-line rent liability for which cash payments are included in operating lease payments and unearned revenue that is not payable in cash . ( 13 ) excludes $ 26.6 million of liabilities for unrecognized tax positions and $ 24.9 million of accrued income tax related interest and penalties included in our consolidated balance sheet as we are uncertain as to when and if the amounts may be settled . settlement of such amounts could require the use of cash flows generated from operations . we expect the unrecognized tax benefits to change over the next 12 months if certain tax matters ultimately settle with the applicable taxing jurisdiction during this timeframe . however , based on the status of these items and the amount of uncertainty associated with the outcome and timing of audit settlements , we are currently unable to estimate the impact of the amount of such changes , if any , to previously recorded uncertain tax positions . off-balance sheet arrangements . we have no material off-balance sheet arrangements as defined in item 303 ( a ) ( 4 ) ( ii ) of sec regulation s-k . interest rate swap agreements . we have entered into interest rate swap agreements to manage our exposure to variability in interest rates on debt in colombia and south africa . all of our interest rate swap agreements have been designated as cash flow hedges and have an aggregate notional amount of $ 79.9 million , interest rates ranging from 5.74% ( 5.74 % ) to 7.83% ( 7.83 % ) and expiration dates through april 2021 . in february 2014 , we repaid the costa rica loan and subsequently terminated the associated interest rate swap agreements . additionally , in connection with entering into the colombian credit facility in october 2014 , we terminated our pre-existing interest rate .
Question: what was the sum of the minimum and the maximum interest rates?

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13.57
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