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\begin{eqnarray*} A(\lambda,\mu,\eta,t) & = & \sum_{n=0}^{\mbox{T}} \, \sum_{m = -n}^{n} X(n,m) (\eta,t) P_{n}^{m}(\mu) e^{im\lambda} \end{eqnarray*} |
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\begin{eqnarray*} A(\lambda,\mu,\eta,t) & = & \sum_{m=-\mbox{T}}^{\mbox{T}} \, \sum_{n = |m|}^{\mbox{T}} X(n,m) (\eta,t) P_{n}^{m}(\mu) e^{im\lambda} \end{eqnarray*} |
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