Hi Mark,
Here's a long term graph of an investment, with some trendlines:
https://img11.hostingpics.net/pics/136674KospiLT.png
When a narrowed date range is selected, e.g. 3 years, the price line is flattened because the scale of the price (min-max) takes into account the trendlines:
https://img11.hostingpics.net/pics/699928KospiST.png
Same with moving averages and Bollinger bands: the price line can be flattened, a lot sometimes when theses elements are far from the price line.
When we want to focus on the price line (its cycles, peaks and valleys), it could be preferable to autoscale the Y-axis with min and max of the prices only, excluded trendlines, moving averages and Bollinger bands. So this would be great if it could be an option!
Thanks.