Subject to the terms and conditions of this Agreement, each Purchaser agrees to purchase at the applicable Closing (as defined below) and the Company agrees to sell and issue to each Purchaser at such Closing a Note, in the form of Exhibit B attached hereto with respect to the Existing Purchasers and in the form of Exhibit C with respect to Helios, in the principal amount set forth opposite such Purchaser’s name on Exhibit A . The purchase price of each Note shall be equal to 100% of the principal amount of such Note. The Company’s agreements with each of the Purchasers are separate agreements, and the sales of the Notes to each of the Purchasers are separate sales.