class_docstr: Class for fitting the Correlation Tensor Model 
class_docstr_tok: ["Class","for","fitting","the","Correlation","Tensor","Model"]
docstr: Returns the 21 independent elements of the covariance tensor as an
  array
docstr_tok: ["Returns","the","21","independent","elements","of","the","covariance","tensor","as","an","array"]
code: def ct(self):
      """
      Returns the 21 independent elements of the covariance tensor as an
      array
      """
      return self.model_params[..., 27:48]
  
imports: import numpy
  from dipy.reconst.multi_voxel import multi_voxel_fit
  from dipy.reconst.base import ReconstModel
  from dipy.reconst.utils import cti_design_matrix
  from dipy.reconst.dki import DiffusionKurtosisFit
  from dipy.reconst.dti import decompose_tensor, from_lower_triangular, lower_triangular, MIN_POSITIVE_SIGNAL
  from dipy.core.onetime import auto_attr
label_desc: Use image node_id 2 for calling the CorrelationTensorFit obj's underlying member method code with example usage: obj.ct() and returns: self