I've been researching futures spread trading and one of the things I'm not understanding is how you chart and apply technical analysis to spreads on an intraday basis. In the attached image, I have the exchange traded spread (top left), the user defined spread (top right) and the components below. The user defined spread is obviously wrong. I'm figuring as a result of no trades occurring on one of the contracts during a candle. The exchange traded spread seems to have ok liquidity, 250 contracts on offer right now but very little volume traded, resulting in the spotty chart. So how do you chart these spreads and apply technical analysis intraday? Also, as I mentioned, the liquidity seems ok for a small trader but are there any issues when things start moving?