For the large-t expansion, we follow the corresponding analysis of (see e.g. [7]) and seek a solution of the form . Indeed (2.7) has a unique solution of this form, which when integrated according to (2.6) implies

As is well known (see e.g. [7]) this leaves the overall multiplicative constant A unspecified. The large-t expansion of is obtained by substituting (3.2) in (2.4).
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