do anyone here use thinkswim to trade option? I do not know how to configure to get intra-day high/low of options? do they have real-time chart? intra-day high/low is very critical to me, the real time chart may be not necessary since I trade options based on the underlying if I trade Calls, but if i trade puts, I need the real time chart to guide me. anyone experienced thinkorswim, give a little bit help here, please.