It is a good practice to do convergence testing by gradually increasing simulation spans. Since mode profile has long tails which can penetrate into the metal electrodes, you may need insrease y span longger. Of course the tail may not be exactly zero. So you can set the colorbar to certain value, say 1e-8 or smaller (intensity, eg, the tail min intensity at the ymax), I believe the loss will not change any further in most cases. You can compare the result with two different y span and see how the loss changes.
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