Matplotlib正在打印两次/多次线条图

如果Matplotlib打印两次或多次这样的线图,会出现什么问题:

import pandas as pd
import numpy as np
import scipy
import matplotlib.pyplot as plt
from scipy import integrate 


def compute_integrated_spectral_response_ikonos(file, sheet):
    df = pd.read_excel(file, sheet_name=sheet, header=2)

    blue = integrate.cumtrapz(df['Blue'], df['Wavelength'])
    green = integrate.cumtrapz(df['Green'], df['Wavelength'])
    red = integrate.cumtrapz(df['Red'], df['Wavelength'])
    nir = integrate.cumtrapz(df['NIR'], df['Wavelength'])
    pan = integrate.cumtrapz(df['Pan'], df['Wavelength'])


    plt.figure(num=None, figsize=(6, 4), dpi=80, facecolor='w', edgecolor='k')
    plt.plot(df[1:], blue, label='Blue', color='darkblue');
    plt.plot(df[1:], green, label='Green', color='b');
    plt.plot(df[1:], red, label='Red', color='g');
    plt.plot(df[1:], nir, label='NIR', color='r');
    plt.plot(df[1:], pan, label='Pan', color='darkred')
    plt.legend(bbox_to_anchor=(1.05, 1), loc='upper left', borderaxespad=0.)
    plt.xlabel('Wavelength (nm)')
    plt.ylabel('Spectral Response (%)')
    plt.title(f'Integrated Spectral Response of {sheet} Bands')
    plt.show()

compute_integrated_spectral_response_ikonos('Sorted Wavelengths.xlsx', 'IKONOS')

这是我的 dataset .