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The following tables define reserved fields relevant to individual model parameters.
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| coefficients | coefficients | REQUIRED. Either a list of floats, or a list of lists of floats, depending on the mathematical form of the response function and possibly the data to which it applies; see further below. |
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| type | type | REQUIRED. String. The mathematical form in which the response function coefficients are provided; see further below. Levels are "eigen" (list of 4 floating-point values must be specified; these are interpreted as three ordered eigenvalues of a rank 2 tensor, followed by a reference *b*=0 intensity.) and "zsh" (Either of (1) a list of floating-point values: Values correspond to the response function coefficient for each consecutive even zonal spherical harmonic degree starting from zero; OR (2) List of lists of floating-point values. One list per unique *b*-value. Each individual list contains a coefficient per even zonal spherical harmonic degree starting from zero. If the response function utilized has a different number of non-zero zonal spherical harmonic coefficients for different *b*-values, these must be padded with zeroes such that all lists contain the same number of floating-point values.) |
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### Demonstrative examples
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#### A basic Diffusion Tensor fit
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storing these values as a list of floats would be erroneously interpreted
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as coefficients of different zonal spherical harmonic degrees for a single *b*-value shell.
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#### A Neurite Orientation and Dispersion Imaging (NODDI) fit
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A fit of the model using the AMICO software.
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Dimensions of NIfTI image "`sub-01_model-noddi_param-icvf_dwimap.nii.gz`": *I*x*J*x*K*1 ([scalar](#encoding-scalar))
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Contents of JSON file "`sub-01_model-noddi_param-direction_dwimap.json`":
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```JSON
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}
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```
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#### An FSL `bedpostx` Ball-And-Sticks fit
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This example includes both bootstrap realizations of the model fit,
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