code: def MGH17(b, x, y=0):
      b = read_params(b)
      model = b[0] + b[1] * exp(-x * b[3]) + b[2] * exp(-x * b[4])
      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 14 for calling a global function with example usage: MGH17(b, x, y) and returns: unknown