code: def gaussian_mod(obj, amplitude, center, sigma):
      return gaussian(obj.get_x(), amplitude, center, sigma)
  
file_path: lmfit-py/tests/test_custom_independentvar.py
imports: import numpy
  from lmfit.lineshapes import gaussian
  from lmfit.models import Model
label_desc: Use image node_id 1 for calling a global function with example usage: gaussian_mod(obj, amplitude, center, sigma) and returns: gaussian