A continuous distribution with the differential @M03716@ of the form: \[f_{\text{w}}(x)\ \text{d}x = \frac{1}{a\ \sqrt{\pi \ x}}\ \exp (- \frac{1}{a^{2}}\ \ln ^{2}\frac{x}{b})\ \text{d}x\] where \(x\) is a parameter characterizing the @C00956@, such as @R05271@ or @D01569@ and \(a\) and \(b\) are positive adjustable parameters.