with open('gaze.csv', 'w') as new_file:
    fieldnames = [' gaze_0_x', ' gaze_0_y', ' gaze_0_z', ' gaze_1_x', ' gaze_1_y', ' gaze_1_z']

    csv_writer = csv.DictWriter(new_file, fieldnames=fieldnames, extrasaction='ignore', delimiter = '\t')

    csv_writer.writeheader()

    for line in csv_reader:
        csv_writer.writerow(line)