code: def arr_plot_blues(binned_array_3bins):
      """Returns an imshow object using the Blues cmap and the arr used to
      plot."""
      bins, im_arr_bin = binned_array_3bins
  
      f, ax = plt.subplots()
      return ax.imshow(im_arr_bin), im_arr_bin
  
imports: import numpy
  import pytest
  import matplotlib
  import matplotlib.pyplot
  from matplotlib.colors import ListedColormap
  import earthpy.plot
label_desc: Use image node_id 4 for calling a global function with example usage: arr_plot_blues(binned_array_3bins) and returns: ax,  im_arr_bin