Currently I have the following :

 grdevices.png(file=filename, width=900, height=512)
 dataf =
Robjects.DataFrame({'phytochemcial':Robjects.StrVector(phytochemicals),
                                'xaxis'  :
Robjects.StrVector(pharmacaphores),
                                'fitvalue' : Robjects.FloatVector(fitvalues)
                                })


    bubble = ggplot2.ggplot(dataf) + \
    ggplot2.aes_string(x='xaxis', y='phytochemcial',size='fitvalue') + \
    ggplot2.geom_point(alpha = 0.2)+ \
    ggplot2.scale_shape(solid = False)+ \
    ggplot2.opts(**{'axis.text.x': ggplot2.theme_text(angle = 45)})
    bubble.plot()
    grdevices.dev_off()

With produces each data-point as filled-circles, is their a possibility to
have the each data-point be a circle that is not filled - thus only a
border?

-- 
Regards/Groete/Mit freundlichen Grüßen/recuerdos/meilleures salutations/
distinti saluti/siong/duì yú/привет

Jurgens de Bruin
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