This Agreement may be executed in one or more counterparts, each of which shall be deemed an original, and all of which together shall constitute one and the same instrument, but in making proof hereof, it shall only be necessary to produce one such counterpart containing signatures pages signed by each party. Signatures by facsimile or by electronic mail delivery of an electronic version (e.g., .pdf or .tif file) of an executed signature page shall be treated as delivery of an original and shall bind the parties hereto .