LIBO Rate Advances. If such Advance is a LIBO Rate Advance, a rate per annum for the Interest Period for such Advance, equal to the sum of the LIBO Rate for such Interest Period plus the Applicable Margin for LIBO Rate Advances as in effectfrom time to time, payable on the last day of such Interest Period and, if such Interest Period has a duration of more than three months, on the three-month anniversary of the first day of such Interest Period, and on the date such LIBO Rate Advance shall be Converted or paid in full.

LIBO Rate Advances. During such periods as such Advance is a LIBO Rate Advance, a rate per annum equal at all times during each Interest Period for such Revolving Credit Advance to the result of (x) the LIBO Rate for such Interest Period for such LIBO Rate Advance plus (y) the Applicable Margin for LIBO Rate Advances in effectfrom time to time plus (z) (in the case of a LIBO Rate Advance denominated in Sterling) the Mandatory Cost, payable in arrears on the last day of such Interest Period and, if such Interest Period has a duration of more than three months, on each day that occurs during such Interest Period every three months from the first day of such Interest Period and on the date such LIBO Rate Advance shall be Converted or paid in full.

LIBO Rate Advances. (a) Converting Floating Rate Advances to LIBO Rate Advances; Procedures. So long as no Default Period exists, the Parent Borrower may convert all or any part of any outstanding Floating Rate Advance into a LIBO Rate Advance by giving notice to the Lender of such conversion not later than 11:00 a.m., Dallas, Texas time, on a Banking Day which is at least three (3) Banking Days prior to thedate of the requested conversion. Each such notice shall be effective upon receipt by the Lender, shall be in writing or by telephone or telecopy transmission, to be confirmed in writing by the Parent Borrower if so requested by the Lender (in the form ofExhibit E), shall specify the date and amount of such conversion, the total amount of the Floating Rate Advance to be so converted and the applicable Interest Period. Each such conversion shall occur on a Banking Day, and the aggregate amount of Floating Rate Advances converted to LIBO Rate Advances shall equal $500,000 or a higher integral multiple of $250,000.

LIBO Rate Advances. During such periods as such Revolving Advance is a LIBO Rate Advance, a rate per annum equal at all times during each Interest Period for such Revolving Advance to the sum of (x) the LIBO Rate for such Interest Period for such Advance, and (y) the Applicable Marginfrom time to timein effect for LIBO Rate Advances that are Revolving Advances, payable in arrears on (1) the last day of such Interest Period and, if such Interest Period has a duration of more than three months, on each day that occurs during such Interest Period every three months from the first day of such Interest Period, (2) the day such Revolving Advances shall be paid in full, and (3) the Revolving Termination Date. During such periods as any Incremental Term Loan is a LIBO Rate Advance, a rate per annum equal at all times during each Interest Period for such Incremental Term Loan to the sum of (x) the LIBO Rate for such Interest Period for such Incremental Term Loan, and (y) the Applicable Margin from time to time in effect for LIBO Rate Advances comprising such Tranche of Incremental Term Loans as set forth in the Notice of Incremental Term Loan Borrowing governing such Tranche, payable in arrears on (1) the last day of such Interest Period and, if such Interest Period has a duration of more than three months, on each day that occurs during such Interest Period every three months from the first day of such Interest Period, (2) the day such Incremental Term Loan shall be paid in full, and (3) the applicable Maturity Date.