png neato preview

Tpng

Hello viz wizards  
os x 10.5.8graphviz binary 2.26.3
using this code
<snippet>
| neato -s -n2 -Nlabel='' -Tpng \
    > $0.png
   
test $OPEN && open $0.png
</snippet>
 
get this response:
Couldn't open the file. It may be corrupt or
a file format that preview does'nt recognize.
libpng is installed
 
Harry osoff
 

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