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One method to retrieve the values of the coordinates that have been clicked on a multiplot matplotlib graph is to use the mpl_connect function to connect a function to the button_press_event.

Here is an example code snippet:

import matplotlib.pyplot as plt

fig, axs = plt.subplots(2, 2)

# define the function to handle mouse clicks
def onclick(event):
    if event.inaxes:
        x, y = event.xdata, event.ydata
        print("Clicked at x = {:.2f}, y = {:.2f}".format(x, y))

# connect the function to the button_press_event
for ax in axs.flatten():
    ax.plot([1, 2, 3], [4, 5, 6])
    cid = ax.figure.canvas.mpl_connect('button_press_event', onclick)

plt.show()

In this example, the onclick function prints the x and y coordinates of the clicked point. The mpl_connect function is called for each subplot to connect the function to the button press event for each subplot.