:'''Direction''' - a required parameter; which specifies the direction of the cross.::[[Above]], [[Over]], [[Below]] or [[Under]] parameters are used to specify the direction of the cross.
== Notes ==
* [[Above]], [[Over]], [[Below]] or [[Under]] parameters specify the direction of the cross.
* [[Above]] and [[Over]] are transposable and specify an upward (lesser to a greater value) direction, and [[Below]] and [[Under]] are transposable and specify a downward (greater to a lesser value) direction.
* The plot of A is defined as having crossed [[Above]] or [[Over]] the plot of B if the value of A is greater than the value of B and one of the following is true: