The price of OPEC's basket of thirteen crudes edged down to US$45.78 a barrel on Friday from $46.78 yesterday, according to OPEC Secretariat calculations, WAM reported. The OPEC Reference Basket of Crudes is made up of the following: Murban (UAE), Saharan Blend (Algeria), Girassol (Angola), Oriente (Ecuador), Rabi Light (Gabon), Iran Heavy (Iran), Basra Light (Iraq), Kuwait Export (Kuwait), Es Sider (Libya), Bonny Light (Nigeria), Qatar Marine (Qatar), Arab Light (Saudi Arabia) and Merey (Venezuela).