Figure 4.

The distribution of spine length has a highly non-Gaussian character which manifests in the large kurtosis (7.97 for the distribution studied versus 2.02 for the distribution of the spine head-width and 0 for the Gaussian distribution). We parametrized the length distributions as a superposition of three Gaussian functions that might represent different classes of spines, yet there is still a clear deviation between the curve and points to which it was fitted for lengths >5μm, these points represent very long filopodia

Ruszczycki et al. BMC Bioinformatics 2012 13:213   doi:10.1186/1471-2105-13-213
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