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        histogram_settings.get('histogram_data_summary', False))
  if histogram_settings['type'] in ('images', 'both'):

    # Since Google Chrome seems to ignore all instructions to not cache, we need
    # to make sure we do not reuse file names - hence the epoch_string - and then
    # we need to 1) update the histograms.html file with the correct file links, and
    # 2) delete the images that are now obsolete.
    epoch_string = '%d_' % round(time.time())

    generated_histograms = ImageHistograms(
        flights,
        histogram_settings['histogram'],
        histogram_settings['histogram_history'],
        filename_prefix=HISTOGRAM_IMAGE_PREFIX + epoch_string)
    html_lines = ReadFile(HISTOGRAM_IMAGE_HTML).split('\n')
    replaced_images = []
    for identifier, new_filename in generated_histograms:
      # for each histogram, find the html_line with the matching id
      # Example line: <img id='destination' src='images/histogram_destination.png'><p>
      n, line = None, None  # addresses pylint complaint

      for n, line in enumerate(html_lines):
        if identifier in line:

          break


      start_char = line.find(WEBSERVER_IMAGE_FOLDER) + len(WEBSERVER_IMAGE_FOLDER)
      end_character = (
          line.find(HISTOGRAM_IMAGE_SUFFIX, start_char) + len(HISTOGRAM_IMAGE_SUFFIX))
      old_filename = line[start_char:end_character]
      line = line.replace(old_filename, new_filename)
      html_lines[n] = line
      replaced_images.append(line[start_char:end_character])
    new_html = '\n'.join(html_lines)
    WriteFile(HISTOGRAM_IMAGE_HTML, new_html)

    # Remove those obsoleted files
    for f in old_filename:
      RemoveFile(f)

  return histogram_messages


def SaveFlightsByAltitudeDistanceCSV(
    flights,
    max_days=0,
    filename='flights_by_alt_dist.csv',
    precision=100):
  """Extracts hourly histogram into text file for a variety of altitudes and distances.

  Generates a csv with 26 columns:
  - col#1: altitude (in feet)
  - col#2: distance (in feet)




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        histogram_settings.get('histogram_data_summary', False))
  if histogram_settings['type'] in ('images', 'both'):

    # Since Google Chrome seems to ignore all instructions to not cache, we need
    # to make sure we do not reuse file names - hence the epoch_string - and then
    # we need to 1) update the histograms.html file with the correct file links, and
    # 2) delete the images that are now obsolete.
    epoch_string = '%d_' % round(time.time())

    generated_histograms = ImageHistograms(
        flights,
        histogram_settings['histogram'],
        histogram_settings['histogram_history'],
        filename_prefix=HISTOGRAM_IMAGE_PREFIX + epoch_string)
    html_lines = ReadFile(HISTOGRAM_IMAGE_HTML).split('\n')
    replaced_images = []
    for identifier, new_filename in generated_histograms:
      # for each histogram, find the html_line with the matching id
      # Example line: <img id='destination' src='images/histogram_destination.png'><p>
      n, line = None, None  # addresses pylint complaint
      found = False
      for n, line in enumerate(html_lines):
        if identifier in line:
          found = True
          break
        found = False
      if found:
        start_char = line.find(WEBSERVER_IMAGE_FOLDER) + len(WEBSERVER_IMAGE_FOLDER)
        end_character = (
            line.find(HISTOGRAM_IMAGE_SUFFIX, start_char) + len(HISTOGRAM_IMAGE_SUFFIX))
        old_filename = line[start_char:end_character]
        line = line.replace(old_filename, new_filename)
        html_lines[n] = line
        replaced_images.append(line[start_char:end_character])
    new_html = '\n'.join(html_lines)
    WriteFile(HISTOGRAM_IMAGE_HTML, new_html)

    # Remove those obsoleted files
    for f in old_filename:
      RemoveFile(f)

  return histogram_messages


def SaveFlightsByAltitudeDistanceCSV(
    flights,
    max_days=0,
    filename='flights_by_alt_dist.csv',
    precision=100):
  """Extracts hourly histogram into text file for a variety of altitudes and distances.

  Generates a csv with 26 columns:
  - col#1: altitude (in feet)
  - col#2: distance (in feet)




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