F&O Manual | Indices in red as FIIs reduce future longs, raise shorts by 2%
On Nifty significant call writing buildup is witnessed in 21,750 and 21,800 strikes, while on the puts front, 21,700-21,600 witnessed considerable Open Interest additions. Overall, the range for the index could be 21,570 on the downside and 21,850 on the upside, said analyst.