I'm using matplotlib to create a simple line plot. My plot is a simple time-series data set where I have time along the x-axis and the value of something I am measuring on the y-axis. y values can have postitive or negative values and I would like to fill in the area above and below my line with the color blue if the y-value is > 0 and red if the y values is < 0. Here's my plot:

enter image description here

As you can see, I can get the blue color to fill in correctly, but I can not get the red color to fill in properly. Here's the basic code I am using:

plt.plot(x, y, marker='.', lw=1)
d = scipy.zeros(len(y))
ax.fill_between(xs,ys,where=ys>=d, color='blue')
ax.fill_between(xs,0,where=ys<=d, color='red')

How can I get the area from a positive y-value to the x-axis to be blue and the area from a negative y-value to the x-axis to be red? Thanks for the help.

python matplotlib
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