My LM340S-5.0 voltage regulator has 3 pins ( IN, OUT, GND ) and tab which is
ground to. I soldered tab to copper plane. 
Does anybody know if it makes difference to which GND I connect ICs ( copper
GND or GND pin ).
It would be handy for me to run one GND path from copper and I'm wondering
if it's good for the design.
What would be recommended solution?

Thank you,
Sam
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