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As the nucleus becomes smaller, we can see that the quadrupole term also becomes smaller. It is precisely this behavior that restricts the use of higher-order terms or not. The multipole expansion can be truncated in a term such that the contribution of the next one is too small to be of importance. In the case for which l/d = 0.2, the quadrupole term is small enough such that the octupole term would be so small that can be neglected, while for l/d = 0.6, this term must be included to have the same convergence as the previous case.
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