Markets are witnessing choppy trading for the past few sessions, with bulls and bears fighting it out for control. Positive global triggers have supported the overall trend, however, India VIX, the volatility indicator, has risen from the recent lows of 20, indicating marginal increase in investor concern. Overall, the expiry is likely to witness enhanced volatility, with a broader-range for Nifty seen between 14800 – 15200 for the current weekly expiry. Maximum OI for the weekly series is seen at 15100 CE & 15000 PE: Aamar Deo Singh, Head, Advisory at Angel Broking