The white region's envelope is defined by edge elements. The white envelope extends from a boundary marked by each edge to the left (-1) boundary of the probability figure. The default white range is defined by two edges:

<edge probability='-1.0' confidence='0.4'/>
<edge probability='-0.8' confidence='1.0'/> 

The probability attribute for each edge defines its position on the probability figure ( X ) axis.

The confidence attribute for each edge defines its position on the confidence figure ( Y ) axis.

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