class_docstr: A class to output more than one thing
  from a GLM pass through arrays of data.
code: def __call__(self, x):
      return self.fn(x)
  
file_path: nipy/nipy/modalities/fmri/fmristat/outputters.py
imports: import numpy
label_desc: Use image node_id 1 for calling the RegressionOutputList obj's underlying member method code with example usage: obj.__call__(x) and returns: self