Blurb::
First parameter of the lognormal distribution (options 1 & 2)

Description::
For the lognormal variables, one may specify either the mean :math:`\mu`  and standard deviation :math:`\sigma`  of the actual lognormal distribution, the mean :math:`\mu` and error factor :math:`\epsilon`  of the actual lognormal distribution.

This corresponds to the mean of the lognormal random variable

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