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All changes to specifications made between editions will be announced in Platts Oilgram Price Report (OPR), in the various Platts fax and telex services and in the real-time service Platts Global AlertPGA).
If you have questions about Platts methodology, or suggestions about changing any of the timing, quality or other parameters listed in the Guide, please contact Platts editorial group.
If you would like details about or copies of older methodology and specification guides please contact oilgroup@platts.com.

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