Blurb:: Shape (alpha) of the inverse gamma hyper-parameter prior

Description:: 
Shape of the prior distribution for calibrated error multipliers.
Either a single value or number of hyper-parameters values may be
specified.

<b>Default:</b> 102.0 (with beta = 103.0) so mean and mode are
approximately 1.0 and standard deviation is about 0.1.

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