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The command
gauss ( <order> ) ;
results in a filter with a Gaussian response. This response approximates the ideal Gaussian transfer function, which is e-(ω/ωc)2 . The higher the order of the filter, the better the approximation. ωc is the cut-off frequency, which is initially 1rad/s. This type of filter will approximately have a factor e , or 8.7dB, damping at 1rad/s. The -3 dB point is at 0.59rad/s. A Gaussian response is similar to a Bessel response. It has a good phase linearity, but poor damping.