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The x-axis label can be formatted in plt.subplots by setting the xlabel parameter on the axes object returned by the function. Here's an example:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

ax.set_xlabel('Time (seconds)')

plt.show()

In this example, we create a new figure and axis object using plt.subplots(). We then set the xlabel of the axis object to 'Time (seconds)' using the set_xlabel() method. This will create a label on the x-axis with the given text.