我有一个.csv文件（csv_test_1.csv），格式为：
durum_before_length,durum_before_reads,durum_after_length,durum_after_reads
0,0,0,0
10,0,10,0
20,0,20,0
30,0,30,1
40,0,40,4
50,0,50,5
60,0,60,0
70,0,70,1
80,0,80,4
90,0,90,1
100,4840,100,4704
110,4817,110,4706
120,4983,120,4860
130,4997,130,4851
140,5142,140,4980
150,5363,150,5192
160,5756,160,5530
170,6054,170,5725
180,6335,180,5989
190,7051,190,6651
200,9003,200,7157
210,8446,210,7812
220,9088,220,8314
230,9761,230,8955
240,10637,240,9660
250,11659,250,10408
260,12572,260,11178
270,13139,270,11538
280,13985,280,11950
290,113552,290,14304
300,954175,300,16383
,,310,17230
,,320,18368
,,330,19158
,,340,19733
,,350,20754
,,360,21698
,,370,21991
,,380,21937
,,390,22473
,,400,22655
,,410,22497
,,420,22460
,,430,22488
,,440,21941
,,450,21884
,,460,21350
,,470,21066
,,480,20812
,,490,19901
,,500,19716
,,510,19374
,,520,19000
,,530,18245
,,540,17220
,,550,15713
,,560,14042
,,570,11932
,,580,7204
,,590,29
您可以看到后两列比前两列长。我想绘制两个重叠的直方图：第一个直方图是第一列，第二列是第二列，y值是第二列，第二个直方图是第三列，第四列为第四列的x值作为y值。
我正在考虑使用seaborn，因为它可以制作漂亮的地块。我到目前为止的代码如下所示。从这里开始，我不知道如何指定x和y值以及如何在同一个图上生成两个重叠的直方图。任何建议都将不胜感激。
import numpy as np
import pandas as pd
from pandas import read_csv
import matplotlib as mpl
import matplotlib.pyplot as plt
import seaborn as sns
read_data = read_csv("csv_test_1.csv")
sns.set(style="white", palette="muted")
sns.despine()
plt.hist(read_data, normed=False)
plt.xlabel("Read Length")
plt.ylabel("Number of Reads")