import numpy as np
import matplotlib.pyplot as mpl
rawdata = np.loadtxt("Data.txt", skiprows=1, usecols=(1, 2, 3, 4))
logdata = np.log2(rawdata)
m1 = np.subtract(logdata[:, 0], logdata[:, 1])
a1 = np.divide(np.add(logdata[:, 0], logdata[:, 1]), 2)
print(mpl.scatter(a1, m1))