It should fix the following too.
https://rt.cpan.org/Ticket/Display.html?id=68031
+ - negative_bg (or set via set_negative_background()) can now be a
+ fill.
+ https://rt.cpan.org/Ticket/Display.html?id=59532
+
+ - calculation of the zero position for horizontal charts was broken,
+ this resulted charts with negative data values having the
+ negative_bg color filled from the left side of the chart off the
+ right side of the image.
+
Imager-Graph 0.09 - 05 Aug 2010
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