#!/usr/bin/env python
# -*- coding: utf-8 -*-
import numpy as np
import matplotlib.pyplot as plt
file_name = 'input-file.txt'
arr = np.fromfile(file_name, float, -1, ' ')

         0.009765625000         0.252220750735
         0.019531250000         0.251969017881
         0.029296875000         0.251551764982

t, y = loadtxt(file_name, usecols=[0,1], unpack=True)

from pylab import *
import numpy as np
import matplotlib.pyplot as plt

from numpy import *
a,b = loadtxt('vectors.dat', usecols=[0,3], unpack=True)