1. The arbitral tribunal, on its establishment, may request the parties to deposit an equal amount as an advance for the costs referred to in

article 40, paragraphs 2 (a)

to (c).

2. During the course of the arbitral proceedings the arbitral tribunal may request supplementary deposits from the parties.

3. If an appointing authority has been agreed upon or designated, and when a party so requests and the appointing authority consents to perform the function, the arbitral tribunal shall fix the amounts of any deposits or supplementary deposits only after consultation with the appointing authority, which may make any comments to the arbitral tribunal that it deems appropriate concerning the amount of such deposits and supplementary deposits.

4. If the required deposits are not paid in full within 30 days after the receipt of the request, the arbitral tribunal shall so inform the parties in order that one or more of them may make the required payment. If such payment is not made, the arbitral tribunal may order the suspension or ter- mination of the arbitral proceedings.

5. After a termination order or final award has been made, the arbitral tribunal shall render an accounting to the parties of the d eposits received and return any unexpended balance to the parties.