GD Graph for placing Y axis help

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Hello every, I have some problems to use GD::Graph::lines. I want to
place the Y axis at the middle of the X axis,but i found no GD
function for this purpose.  Are there any functions like zero_axis and
zero_axis_only who can draw the axis for y values of 0. Can anyone
tell me if there have any functions similar to draw the Y axis at the
middle of X axis.Thanks!

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