text: #!/usr/bin/env python
  
  import load
  from gna.env import env
  
  # Make a variable for global namespace
  ns = env.globalns
  
  # Create a parameter in the global namespace
  ns.defparameter('norm', central=1.0, sigma=0.1, label='Normalization')
  
  # Create (or access) nested namespace 'eff'
  effns = ns('eff')
  
  # Create a couple of parameters in the nested namespace
  effns.defparameter('eff1', central=0.9, sigma=0.01, label='Efficiency #1')
  effns.defparameter('eff2', central=0.8, sigma=0.02, label='Efficiency #2')
  
  # Create a parameter in a nested namespace (from the global namespace)
  ns.defparameter('eff.eff3', central=0.95, sigma=0.015, label='Efficiency #3')
  
  # Create a couple of parameters in the third level namespace
  ns.defparameter('misc.pars.par1', central=10.0, sigma=1, label='Some parameter')
  ns.defparameter('misc.pars.par2', central=11.0, sigma=1, label='One more parameter')
  
  # Print the list of parameters
  ns.printparameters(labels=True)
  