This setting will be available if you have selected Area
as your Threshold Type. Area threshold type requires a start point (Value
From) and end point (Value To). Value From determines the
start point of the area. Enter the coordinate on the axis where you wish to
place the start point of the area threshold.
This setting is available if you have selected Constant
as your Value Type. For other value types, the threshold start point
will be placed at the dynamically calculated value.

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