~~ data name/kind ... ~~
~~ A concise (1-5 lines) description of the dataset. ~~
The format is: expression(log(a * exp(b * x - a * (exp(b * x) - 1)/b)))
~~ If necessary, more details than the __description__ above ~~
~~ reference to a publication or URL from which the data were obtained ~~
~~ possibly secondary sources and usages ~~
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