code: def plotCurve(self):
          
          try:
              attenuations, freqs = self.datafile.get_calibration(str(self.ui.calChoiceCmbbx.currentText()), self.calf)
              self.pw = SimplePlotWidget(freqs, attenuations, parent=self)
              self.pw.setWindowFlags(QtCore.Qt.Window)
              self.pw.setLabels('Frequency', 'Attenuation', 'Calibration Curve')
              self.pw.show()
          except IOError:
              QtGui.QMessageBox.warning(self, "File Read Error", "Unable to read calibration file")
          except KeyError:
              QtGui.QMessageBox.warning(self, "File Data Error", "Unable to find data in file")
docs: Shows a calibration curve, in a separate window, of the currently selected calibration