code: def get_start(cc, order):
      if order % 1 == 0:
          start = math.floor(cc) - order // 2
      else:
          start = math.floor(cc + 0.5) - order // 2
      return start
  
imports: import math
  import numpy
  import matplotlib.pyplot
  from matplotlib import ticker
label_desc: Use image node_id 1 for calling a global function with example usage: get_start(cc, order) and returns: start