#!/usr/bin/env python

 from    pylab           import scatter, show, cm, colorbar, axes, savefig

 from    itertools       import izip

 from    sys             import argv, exit

 import  os.path         as     osp

 def plot(val1_fn, val2_fn, outfn = None):

     values1 = []

     with open(val1_fn) as fp:

         for line in fp.xreadlines():

             values1.append(float(line.split()[1]))

     values2 = []

     with open(val2_fn) as fp:

         for line in fp.xreadlines():

             values2.append(float(line.split()[1]))

     values1 = [v % 1. for v in values1]

     values2 = [v % 1. for v in values2]

     print min(values1), max(values2), min(values1), min(values2)

     scatter(values1, values2, s=10)

     axes().set_aspect('equal')

     if not outfn:

         show()

     else:

         savefig(outfn)

 if __name__ == '__main__':

     if len(argv) < 3:

         print "Usage: %s VALUES1 VALUES2 [OUTPUT]" % argv[0]

         exit()

     val1_fn = argv[1]

     val2_fn  = argv[2]

     outfn = None

     if len(argv) > 3: 

         outfn = argv[3]

     plot(val1_fn, val2_fn, outfn)