It's too simple. The aspect ratio is the ratio of height to width. If the ratio is 1:1, your trendlines/MAs are going to tend toward the vertical. If it's 1:5, they're going to be nearly horizontal.
This has come up a lot in the beginner groups I've worked with. Most charting programs allow you to put multiple windows within a frame. This geewhiz feature appeals to people who want to put multiple indicators above/below their price windows. Unfortunately, if they don't expand the frame, the windows are so narrow that it's nearly impossible to tell whether the indicator is up or down, much less detect a divergence.
If I give you a specific aspect ratio, there will be at least a dozen posts getting into how full of crap I am and how the aspect ratio ought to be this or that or it doesn't matter and so on for several pages. So I'd rather suggest that you experiment. When you see a chart on a website, what is its aspect ratio?
And by "aspect ratio", I'm referring to the price window. If you add volume or indicators, the price window will narrow and you'll have to expand the frame in order to keep the price window what it was before you started adding all the other stuff.
