code: def Eckerle4(b, x, y=0):
      b = read_params(b)
      model = (b[0] / b[1]) * exp(-0.5 * ((x - b[2]) / b[1]) ** 2)
      return model - y
  
imports: import os
  from numpy import arctan, array, cos, exp, log, sin
  from lmfit import Parameters
label_desc: Use image node_id 7 for calling a global function with example usage: Eckerle4(b, x, y) and returns: unknown