Hi,

For your zero-line, you'll want to use a Range Marker:
"chm=r,ff0000,0,0.49,0.51"

As to an "array populated script", are you referring to an interactive
chart using the Google Visualization API? If so, both the image and
dynamic line charts support negative numbers and they're pretty easy
to configure. Check out:

http://code.google.com/apis/ajax/playground/?type=visualization#image_line_chart
http://code.google.com/apis/ajax/playground/?type=visualization#line_chart

If you need help with the Visualization API, you'll want to post your
questions to the appropriate forum @ 
http://groups.google.com/group/google-visualization-api

Cheers,
Keith

http://code.google.com/apis/ajax/playground/?type=visualization#line_chart

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