.degree (numeric)
 fit.smoothing_parameters.family (string)
 fit.smoothing_parameters.link (string)
 fit.smoothing_parameters.kernel (string)
 fit.smoothing_parameters.kernel_type (string)
 fit.smoothing_parameters.deren 
 fit.smoothing_parameters.deit
 fit.smoothing_parameters.demint
 fit.smoothing_parameters.debug

 fit.fit_points.evaluation_points (d*nv matrix)
 fit.fit_points.fitted_values (matrix, nv rows, many columns)
 fit.fit_points.evaluation_vectors.cell
 fit.fit_points.evaluation_vec