a particular party hereto is act- ing as Buyer is less than the aggregate Buyers Margin Amount for all such Transactions (a "Margin Deficit"), then Buyer may by notice to Seller require Seller in such Transactions, at Sellers option, to transfer to Buyer cash or additional Securities reasonably acceptable to Buyer ("Additional Purchased Securities"), so that the cash and aggregate Market Value of the Purchased Securities, including any such Additional Purchased Securities, will thereupon equal or exceed such aggregate Buyers Margin Amount (decreased by the amount of any Margin Deficit as of such date arising from any Transactions in which such Buyer is acting as Seller).   (b) If at any time the aggregate Market Value of all Purchased Securities subject to all Transactions in which a particular party hereto is act- ing as Seller exceeds the aggregate Sellers Margin Amount for all such Transactions at such time (a "Margin Excess"), then Seller may by notice to Buyer require Buyer in such Transactions, at Buyers option, to transfer cash or Purchased Securities to Seller, so that the aggregate Market Value of the Purchased Securities, after deduction of any such cash or any Purchased Securities so transferred, will thereupon not exceed such aggregate Sellers Margin Amount (increased by the amount of any Margin Excess as of such date aris- ing from any Transactions in which such Seller is acting as Buyer).   (c) If any notice is given by Buyer or Seller under subparagraph (a) or (b) of this Paragraph at or before the Margin Notice Deadline on any business day, the party receiving such notice shall transfer cash or Additional Purchased Securities as provided in such subpara-     graph no later than the close of business in the relevant market on such day. If any such notice is given after the Margin Notice Dead- line, the party receiving such notice shall transfer such cash or Securities no later than the close of business in the relevant market on the next business day following such notice.   (d) Any cash transferred pursuant to this Paragraph shall be attributed to such Transactions as shall be agreed upon by Buyer and Seller.   (e) Seller and Buyer may agree, with respect to any or all Transactions hereunder, that the respective rights of Buyer or Seller (or both) under subparagraphs (a) and (b) of this Paragraph may be exer- cised only where a Margin Deficit or Margin Excess, as the case may be, exceeds a specified dollar amount or a specified percentage