Is it possible to have a step line with gaps? I'm talking about the square wave kind of line (step line) that would have gaps?
This kind of line (at least in my case) is drawn from such a dataset that has the start time and the new value (level) as one data point. For example can I set NULL to be a level to achieve gaps in the line?
Yes, it's possible. Just add null point when you need a gap. Just like this: http://jsfiddle.net/mCLpr/