What is a 'smooth bore' tank, and how does it typically compare to a baffled tank in terms of handling?

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1. A tank with more baffles than usual, producing weaker surge effects
2. A tank that automatically compensates for surge electronically
3. A tank with no internal baffles, which generally produces stronger surge effects than a baffled design
4. A term unrelated to internal tank structure, referring only to the smoothness of the tank's outer paint coat

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