Unused Fee From and after the Closing Date, and during such times in which the Borrower does not have two (2) Investment Grade Ratings (and clause (a) of the definition of “Applicable Percentage” shall be applicable), the Borrower agrees to pay the Administrative Agent for the ratable benefit of the Lenders an unused fee (the “Unused Fee”) for each calendar quarter (or portion thereof) in an amount equal to (a) 0.35% (or 0.50% to the extent that as of the beginning of any day, the Outstanding Amount of Revolving Obligations (excluding the amount of any then-outstanding Swing Line Loans) is less than 50% of the Aggregate Revolving Commitments), multiplied by (b) the amount by which the Aggregate Revolving Commitments exceed the sum of the Outstanding Amount of Revolving Obligations (excluding the amount of any then-outstanding Swing Line Loans) as of the beginning of such day. To the extent applicable, the Unused Fee shall accrue at all times during the Commitment Period (and thereafter so long as Revolving Obligations shall remain outstanding), including periods during which the conditions to Extensions of Credit in Section 4.02 may not be met, and shall be payable quarterly in arrears on the last day of each March, June, September and December, commencing with the first such date to occur after the Closing Date, and on the Termination Date (and, if applicable, thereafter on demand); provided, that, pursuant to Section 2.15(a)(iii), (i) no Unused Fee shall accrue on the Commitment of a Defaulting Lender so long as such Lender shall be a Defaulting Lender and (ii) any Unused Fee accrued with respect to the Commitment of a Defaulting Lender during the period prior to the time such Lender became a Defaulting Lender and unpaid at such time shall not be payable by the Borrower so long as such Lender shall be a Defaulting Lender. The Administrative Agent shall distribute the Unused Fee to the Lenders pro rata in accordance with the respective Revolving Commitments of the Lenders.