What is the settlement price for contracts not squared off

I was short on bn 30600 that expired today. The closing price is 150 and the nseindia website shows the settlement price as 139.5. I did not square off my position thinking that the price will be settlement price. However it has been squared off at 181 rupees. What

is the basis for this? Nseindia screenshot is attached. It will be great if someone can give a link that has authoritative information.

BN closed at 30781. So the settlement value of 30600ce will be 181.

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