SPX Fly ZoneWhat each fly draws
Rectangle: the top is the fly price plus the premium, and the bottom is the fly price minus the premium.
Middle line: a dashed line at the fly price.
Label: it sits at the rectangle’s right edge on the middle line. It reads like 7720 ±20 (width 50). Hovering shows the top, center, bottom, premium and width. The text is black or white depending on how light the fly’s color is.
Width: it only appears in the label and doesn’t affect the rectangle.
When it draws: a fly appears o
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