Futures contracts of coriander on the NCDEX erased early gains and hit 3% lower circuit despite imposition of special margin on sell-side. Profit booking by investors after prices hit a one-week high led to the decline in prices. The total margin on coriander is 17.5%, including additional margin of 2.5%, on all running and yet-to-be-launched contracts. The front-month May contract on the exchange traded down 1.2% from the previous close, while June contract was down 1.3%.