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make these executable:  
   chmod +x pcb.py  
   chmod +x frep.py  

execute:  
   pcb.py | frep.py  

view:  
   out.png

optional arguments:  
   pcb.py | frep.py dpi  
   pcb.py | frep.py dpi filename  

dependencies:  
   Python  
   NumPy  
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   Python Imaging Library  

sample:  
![](http://academy.cba.mit.edu/classes/embedded_programming/hello.arduino.328P.png)