The gases formed in sodium-symmetric cells should be a good indicator of the gases released from the counter electrode in half-cell experiments. In half-cells, the amount of gas released by the Na electrode alone should be about half of what is detected in the symmetrical cells. Also, as mentioned above, gas release in the symmetric cells is rather continuous and does not change when reversing plating/stripping. This means that all changes in gas release during cycling of the half cells can be attributed to processes involving the NaMNO cathode. That can be evolution directly form the cathode, or from crosstalk of side products from the cathode to anode and vice versa.