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E standard cell, which is sometimes called Enot, is the standard state cell potential at state conditions, which is 25C, 1 atm. Ecell is the cell potential at non standard state condition. This value can be found by using the Nernst Equation.
E° refers to standard conditions, such as 1M, 1atm, 25°C (This is found using the cathode-anode), while E is not under these same conditions and can be found using the Nernst equation. As long as you have one of them known, the Nernst equation can be used to find the other.
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