code: def gauss(x, amp, cen, sigma):
      """Gaussian lineshape."""
      return amp * np.exp(-((x - cen) ** 2) / (2.0 * sigma**2))
  
imports: import matplotlib.pyplot
  import numpy
  from lmfit import Parameters, minimize, report_fit
label_desc: Use image node_id 1 for calling a global function with example usage: gauss(x, amp, cen, sigma) and returns: unknown