new_contents: from PySide import QtCore, QtGui
  import os,sys
  from bgsub import SpectrumData
  from matplotlib import pyplot as plt
  
  path = "/home/danielle/Documents/LMCE_one"
  
  file_list = [f for f in sorted(os.listdir(path)) if f.endswith(".txt")]
  os.chdir(path)
  spectra = []
  for each in file_list:
      spectra.append(SpectrumData.from_file(each))
  
  #import matplotlib
  from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
  from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar
  from matplotlib.figure import Figure
  
  qapp = QtGui.QApplication(sys.argv)
  qwidget = QtGui.QWidget()
  qwidget.setGeometry(QtCore.QRect(0, 0, 500, 500))
  qlayout = QtGui.QHBoxLayout(qwidget)
  qwidget.setLayout(qlayout)
  
  qscroll = QtGui.QScrollArea(qwidget)
  qscroll.setGeometry(QtCore.QRect(0, 0, 500, 500))
  qscroll.setFrameStyle(QtGui.QFrame.NoFrame)
  qlayout.addWidget(qscroll)
  
  qscrollContents = QtGui.QWidget()
  qscrollLayout = QtGui.QHBoxLayout(qscrollContents)
  qscrollLayout.setGeometry(QtCore.QRect(0, 0, 1000, 1000))
  
  qscroll.setWidget(qscrollContents)
  qscroll.setWidgetResizable(True)
  
  for spectrum in spectra:
  
      qfigWidget = QtGui.QWidget(qscrollContents)
  
      fig = Figure()
      canvas = FigureCanvas(fig)
      canvas.setParent(qfigWidget)
      toolbar = NavigationToolbar(canvas, qfigWidget)
      plt = fig.add_subplot(111)
      plt.scatter(*zip(*spectrum.info))
  
      # place plot components in a layout
      plotLayout = QtGui.QVBoxLayout()
      plotLayout.addWidget(canvas)
      plotLayout.addWidget(toolbar)
      qfigWidget.setLayout(plotLayout)
  
      # prevent the canvas to shrink beyond a point
      # original size looks like a good minimum size
      canvas.setMinimumSize(canvas.size())
  
      qscrollLayout.addWidget(qfigWidget)
  
  qwidget.show()
  exit(qapp.exec_())
subject: Test interface for showing plots