Severability and Headings. If any provision herein is held to be invalid or unenforceable for any reason, the remaining provisions will continue in full force without being impaired or invalidated in any way. The parties agree to replace any invalid provision with a valid provision that most closely approximates the intent and economic effect of the invalid provision. Headings are for reference purposes only and in no way define, limit, construe or describe the scope or extent of such section.