diff --git a/work/week6/series/homework2/src/plot_results.py b/work/week6/series/homework2/src/plot_results.py
index 2365dbf..e40d708 100644
--- a/work/week6/series/homework2/src/plot_results.py
+++ b/work/week6/series/homework2/src/plot_results.py
@@ -1,58 +1,58 @@
 # -*- coding: utf-8 -*-
 # @Author: Theo Lemaire
 # @Date:   2018-10-16 11:52:15
 # @Last Modified by:   Theo Lemaire
 # @Last Modified time: 2018-10-23 18:57:39
 
 import os
 from argparse import ArgumentParser
 import matplotlib.pyplot as plt
 import numpy as np
 
 
 def plotSeries(iterations, values, fs=15, lw=2):
 
     fig, ax = plt.subplots(figsize=(10, 6))
     ax.set_xlabel('# iterations', fontsize=fs)
     ax.set_ylabel('value', fontsize=fs)
     ax.plot(iterations, values, label='series', linewidth=lw)
     for item in ax.get_xticklabels() + ax.get_yticklabels():
         item.set_fontsize(fs)
     return fig
 
 
 def main():
 
     # Define argument parser
     ap = ArgumentParser()
     ap.add_argument('-i', '--inputfile', type=str, help='Input filename')
 
     # Parse arguments
     args = ap.parse_args()
     filepath = args.inputfile
 
     # Infer separator character from file extension
     filename = os.path.basename(filepath)
     filecode, ext = os.path.splitext(filename)
     print(filecode, ext)
     if ext == '.csv':
         separator = ','
     elif ext == '.txt':
-        separator = ' '
+        separator = '\t'
     elif ext == '.psv':
         separator = '|'
 
     # Load data
     data = np.genfromtxt(filepath, delimiter=separator)
     iterations = data[1:, 0]
     values = data[1:, 1]
 
     # Plot series
     fs = 20
     fig = plotSeries(iterations, values, fs=fs)
     fig.suptitle('{} evolution'.format(filecode), fontsize=fs)
     plt.show()
 
 
 if __name__ == '__main__':
     main()
diff --git a/work/week6/series/homework2/src/write_series.cc b/work/week6/series/homework2/src/write_series.cc
index 0ed8ded..c3db15d 100644
--- a/work/week6/series/homework2/src/write_series.cc
+++ b/work/week6/series/homework2/src/write_series.cc
@@ -1,36 +1,38 @@
 #include <iostream>
 #include <fstream>
 #include <algorithm>
 #include <string>
 
 #include "write_series.hh"
 
 // Constructor
 WriteSeries::WriteSeries(Series& series, unsigned int maxiter, std::string separator) : DumperSeries(series) {
     this->maxiter = maxiter;
     this->separator = separator;
 }
 
 // Compute and write serie on file
 void WriteSeries::dump(std::ostream & os) {
     // write sequential iterations to file
     std::string sname = this->series.getName();
     std::transform(sname.begin(), sname.end(), sname.begin(), ::tolower);
     std::string ext;
     if (this->separator == ",") {
         ext = ".csv";
     } else if (this->separator == "" || this->separator == "\\t") {
+        // Re-assignment of space character to tab to preserve unique separator extension match
+        this->separator = "\t";
         ext = ".txt";
     } else if (this->separator == "|") {
         ext = ".psv";
     }
     std::string filename = sname + ext;
     std::cout << "File " << filename.c_str() << " has been created." << std::endl;
 
     std::ofstream fout(filename.c_str());
-    fout << "iteration" << separator << "value" << std::endl;
+    fout << "iteration" << this->separator << "value" << std::endl;
     for (unsigned int N = 1; N < this->maxiter + 1; ++N) {
         fout << N << separator << this->series.compute(N) << std::endl;
     }
     fout.close();
 }