【卒論】Pythonで論文用の複合グラフを綺麗に作成する

import matplotlib.pyplot as plt
import numpy as np

# 論文用の設定
# centimeters in inches
cm = 1/2.54 

plt.rcParams['font.family'] = 'Helavetica' # font familyの設定
plt.rcParams['mathtext.fontset'] = 'stix' # math fontの設定
plt.rcParams["font.size"] = 12
plt.rcParams['figure.subplot.bottom'] = 0.15
plt.rcParams['figure.subplot.left'] = 0.15
plt.rcParams['axes.axisbelow'] = True

# データ作成
x = np.array([1, 2, 3, 4, 5])
data1 = [30,50,90,40,70];
data2 = [50,70,50,30,80];
label = ["2018","2019","2020","2021","2022"]

# グラフの定義
fig = plt.figure(figsize=(12*cm, 8*cm),dpi=300)
ax_left = fig.add_subplot(1,1,1)
ax_right = ax_left.twinx()

# グラフのプロット
# 左軸（折れ線）
P = ax_left.plot(x, 
                 data1, 
                 label=label, 
                 color="#000000",
                 marker="^",
                 markerfacecolor='#ffffff',
                 markeredgecolor="#000000",
                 markersize = 6)

# 右軸（棒グラフ）
B = ax_left.bar(x, 
                 data2, 
                 tick_label=label, 
                 align="center",
                 color="#858584")

# 凡例の設定
plt.legend((P[0], B[0]), ("plot", "bar"), 
            loc='lower center', 
            bbox_to_anchor=(.5, 1.1), 
            ncol=3,
            fancybox=False,
            edgecolor="k")

# 軸周りの設定
ax_left.set_ylim(0, 100)
ax_left.set_xlabel("Time")
ax_left.set_ylabel("Volume1 [XX]")

ax_right.set_ylim(0, 100)
ax_right.set_xlabel("Time")
ax_right.set_ylabel("Volume2 [XX]")

ax_left.grid(axis='y',linestyle='-', color='#e0e0e0')
fig.savefig("complex.png", format="png", dpi=300, bbox_inches='tight')
fig.show()