Hello Eric, 

 I have run 
roslaunch uvc_camera stereo_node.launch
then,
rosrun stereo_image_proc stereo_image_proc __name:=proc 

then, rxgraph gives,

/uvc_camera_stereo and /proc are independently connected to the /rosout but
no connection in between them.

I have calibrated both the cameras.

-Abhy 
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