Overlay + PCB
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LEAD SELECTOR
On       [All others off]
I           -      1, 8 
II            -      2, 8 
III          -       6, 2 
aVR         -      4, 5, 6 
aVL         -      1, 6, 8 
aVF        -      2, 5, 8 
V            -     3, 5, 6, 8 

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