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The objective function will be evaluated at points defined on a 3D
lattice that covers the volumes that have to be fit. The spacing
between these lattice points must be specified.
- -step
- is the option that specifies the distance between points
in the 3D lattice. Normally, one should set -step to be
equal to less than half the fwhm of the blurring kernel of
the data to be fit.