Hi,

I'd like to plot 'open symbols' (i.e. not color filled) w/ scatter. 
Unfortunately, scatter doesn't support None color:

scatter(randn(5),randn(5), s=(50,), c=None, edgecolor='r')

or

scatter(randn(5),randn(5), s=(50,), facecolor=None, edgecolor='r')

fail w/

ValueError: to_rgb: Invalid rgb arg "None"

Any hint on how to do it? Could None color be supported by scatter, or 
should I set the markersize of each symbol from a plot command individually?

Cheers.

PS: this is a similar question as 
http://sourceforge.net/mailarchive/message.php?msg_id=11876753, but 
there was no answer it seems...
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