values, the amount of smoothing "         "will be different for each spatial dimension.\n"         "The optional 'sigma_d' (single, tuple, or list) denotes the resolution standard deviation "         "per axis, the optional 'step_size' (single, tuple, or list) the distance between two adjacent "         "pixels for each dimension. "         "The length of the tuples or lists must be equal to the "         "number of spatial dimensions.\n\n"                 "'window_size' and 'roi' have the same meaning as in :func:`gaussianSmoothing`.\n\n"         "For details see s