This excerpt taken from the MIR 8-K filed Jan 18, 2007.
6.20 Letter of Credit. On or prior to January 18, 2007, Buyer shall either (i) provide to Seller an amount in cash equal to 10% of the Base Purchase Price to be held by Seller as collateral segregated from other accounts to secure Buyers obligations under Section 9.2, or (ii) deliver to Seller the Letter of Credit, and Buyer thereafter shall cause the Letter of Credit to remain in full force and effect (or a substitute letter of credit containing substantially identical terms and credit to the Letter of Credit delivered to remain in full force and effect) until the Closing or as otherwise expressly provided herein. Seller shall not draw upon, or exercise any rights with respect to, the Letter of Credit except to the extent Seller is permitted to do so under Section 9.2(b) of this Agreement. On the earlier of (a) the Closing Date or (b) five Business Days after the date on which this Agreement is terminated in a manner which does not give rise to a right on the part of Seller to draw on the Letter of Credit pursuant to Section 9.2(b), Seller shall instruct the bank issuing the Letter of Credit to terminate the Letter Credit and shall surrender the Letter of Credit to such bank for cancellation.