Oil and Gas Regulatory Authority (OGRA) on Thursday issued a contract for emergency audit of the CNG stations. The contract of audit has been issued to Owais Haider and Noman Liaquat auditing firm.The firm would recommend the production cost and the profit of the CNG stations. The audit company is expected to present its recommendations by Nov 12. Profit margin of the CNG stations would be decided on the recommendations of the audit report, the sources said. Owais Haider and Noman Liaquat Company is among the 14 best auditing firms as ranked by the State Bank of Pakistan.