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How to handle the plotting problem in minute basis?

I'm a starter in Quantopian. I'm learning the basic research knowledge and I'm trying to plot the historical price in Notebook. But I when I tried to plot the minute price data, the graph shows really weird(attached below). I think the problem is that the graph included the time period where the market is closed, and there are no price data during that period. So what can I do to filter out that period from the graph? Thank you!

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