[Python] How to hide overlapping regions on offset line charts in python

I want to make a "3d" offset figure of chromatogram traces. I am doing this by offsetting in both x & y but the background traces are "showing through" the area under the peaks in the foreground.

import numpy as np
import matplotlib
import matplotlib.pyplot as plt

import pandas as pd

df = pd.read_csv('stat-neg-GMtet-lin.csv', usecols=['Time (min)','TIC'])
df_2 = pd.read_csv('stat-neg-GMtet-lin.csv', usecols=['Time (min)', 'TIC'])

x = df['Time (min)']
y = df['TIC']

x_off2 = df_2['Time (min)'] + 0.35
y_off2 = df_2['TIC'] + 0.2

plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.xlabel('Time (min)')
plt.ylabel('TIC')

plt.plot(x_off2, y_off2)
plt.plot(x, y)

plt.fill_between(x, y, color='orange', alpha=1)

plt.show()


I tried using the `fill_between' function but this still allowed for the background trace to show through

import numpy as np
import matplotlib
import matplotlib.pyplot as plt

import pandas as pd

df = pd.read_csv('stat-neg-GMtet-lin.csv', usecols=['Time (min)','TIC'])
df_2 = pd.read_csv('stat-neg-GMtet-lin.csv', usecols=['Time (min)', 'TIC'])

x = df['Time (min)']
y = df['TIC']

x_off2 = df_2['Time (min)'] + 0.35
y_off2 = df_2['TIC'] + 0.2

plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.xlabel('Time (min)')
plt.ylabel('TIC')

plt.plot(x_off2, y_off2)
plt.plot(x, y)

plt.fill_between(x, y, color='orange', alpha=1)

plt.show()

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