What provisions exist for a coordination between states under the Constitution?
The provisions for coordination between states under the Constitution are as follows:

1. Article 263: Provisions with respect to an inter-State Council.

This article empowers the President of India to establish an Inter-State Council to facilitate and promote cooperation among States, coordinate their policies, and ensure that the interests of each state are adequately protected while promoting national integration. The Council consists of Prime Minister (Chairperson), Governors or Chief Ministers of all states, and members of Union Cabinet dealing with inter-state matters.

2. Article 262: Disputes relating to Waters.

This article deals with the adjudication of disputes related to the waters of inter-state rivers or river valleys. The President may constitute a tribunal for this purpose upon the request of one or more states, and its decision shall be final and binding on all parties involved.

These two provisions in the Constitution ensure better coordination between states by providing mechanisms for dispute resolution and promoting cooperation on inter-state matters.