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Price range



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Is there a Function or ? that can be written to continually qualify a chart as
having a range of x number of points?  For instance, the mimumum price would
always be 500 points less than the maximum price, even as intra-day prices are
evolving?

Might this might have something to do with screen scaling, but having the
range of the screen's price range be y points (600?), allowing for a "margin"
above and below the price range of x points (500)?

Often, Minimum and Maximum price scaling has to be changed when eveloving
prices "run off".    Having this would allow for a set price range to always
be on 
the screen within set limits, unlike the "Screen" scaling that will vary the
range of prices.

Thanks to anyone for help with this