This is not a problem of pgf/tikz. If you put your tikzpicture into a \fbox, you'll see that the box is tight.
It is then a problem of the preview package. I'm not familiar with this package, but apparently, removing the preview environment solves the problem. It is not required, since you already declared tikzpicture as an enviroment to be "previewed".
Saludos,
--JL Diaz
On Sat, May 30, 2009 at 5:34 PM, Michael Kubovy
<kubovy@...> wrote:
Dear Friends,
Below is the code for a figure I am producing. My problem is that it
is not cropped enough horizontally. Is there a remedy? (It would help
me if you could cc my email when replying to the list.)
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