#!/usr/bin/env python

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

table = np.loadtxt(sys.stdin, unpack=True, skiprows=2, delimiter='|')
calls, I_MC, σ_MC, I_MI, σ_MI, I_VE, σ_VE, chi = table
exact = 1.7182818285

plt.rcParams['font.size'] = 17

plt.figure()
plt.title('Plain MC', loc='right')
plt.ylabel('$I^{oss}$')
plt.xlabel('calls')
plt.xscale('log')

plt.axhline(y=exact,  color='#c556ea',  linestyle='-',
            label='Exact value')
plt.errorbar(calls, I_MC, linestyle='', marker='o',
             yerr=σ_MC, color='#92182b', label='Plain MC')
plt.errorbar(calls, I_MI, linestyle='', marker='o',
             yerr=σ_MI, color='black',   label='MISER')
plt.errorbar(calls, I_VE, linestyle='', marker='o',
             yerr=σ_VE, color='gray',    label='VEGAS')

plt.legend()
plt.show()