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I don't know if you have considered this, but it would be really useful if the y-axis scale only draws a line and a text price for a valid price in the underlying instrument. I understand for stocks, there are many, many prices that are fractional pennies, but, e.g. Nikkei 225 futures are in 10-point increments; when i expand the y-scale, lines are drawn at 10828, 10832. it is difficult to ascertain the actual movement, when invalid prices are drawn .