TRUST INDENTURE DATED AS OF THE ● DAY OF ●, 201___ AMONG BAYTEX ENERGY CORP., AS ISSUER AND PARENT GUARANTOR AND BAYTEX ENERGY LTD., BAYTEX ENERGY PARTNERSHIP, BAYTEX MARKETING LTD., BAYTEX COMMERCIAL TRUST 1, BAYTEX COMMERCIAL TRUST 2, BAYTEX...