.. index:: ThermalNeutronBk2BkExpSigma
ThermalNeutronBk2BkExpSigma is a function to calculate \sigma(d_h) of :ref:`ThermalNeutronBk2BkExpConvPVoigt <func-ThermalNeutronBk2BkExpConvPVoigt>`. It is defined as
\sigma(d_h) = \left(\sigma_0^2 + \sigma_1^2 + d_h^2 + \sigma_2^2 + d_h^4\right)^{0.5}
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