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This is a bugfix release. Two bugs affecting specific calculations of the spectral density gradient and Hessian have been removed. One occurs in the Hessian when optimising the spherical diffusion parameters simultaneously with the parameters ''S<sub>f</sub><sup>2</sup>'', ''τ<sub>f</sub>'', ''S<sup>2</sup>'', and ''τ<sub>s</sub>''. The other affects the gradient when optimising the parameters ''S<sub>f</sub><sup>2</sup>'', ''S<sub>s</sub><sup>2</sup>'', and ''τ<sub>s</sub>''.
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