567. Correction of the award or additional award.

The parties1 are free to agree on the powers of the arbitral tribunal2 to correct an award or make an additional award3. If or to the extent there is no such agreement4, the tribunal may on its own initiative or on the application of a party correct an award so as to remove any clerical mistake or error arising from an accidental slip or omission or clarify or remove any ambiguity in the award5, or make an additional award in respect of any claim (including a claim for interest or costs) which was presented to the tribunal but was