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Attribute Inherited from Preferences?
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Note's Y-axis map co-ordinates (in map units).
$Ypos = 0 is the middle of the Y-axis of the map, with negative values moving up [sic], positive values moving down. Note the Y-axis value orientation is the reverse of normal Cartesian Y co-ordinates, but does makes sense in the context of a visual top-left-to-bottom-right visual layout. See Map Co-ordinates.
See also $Xpos.
Aliases do not inherit this property from their original but have their own value.