docs: def appendData(self, axeskey, bins, ypoints):
          """Appends data to existing plotted data
  
          :param axeskey: name of data plot to update. Valid options are 'stim' or 'response'
          :type axeskey: str
          :param bins: bins to plot a point for
          :type bin: numpy.ndarray
          :param ypoints: iteration number of raster, *should* match bins dimension, but really takes the first value in array for iteration number and plot row at proper place for included bins
          :type ypoints: numpy.ndarray
          """
          if axeskey == 'raster' and len(bins) > 0:
              x, y = self.rasterPlot.getData()
              # don't plot overlapping points
              bins = np.unique(bins)
              # adjust repetition number to response scale
              ypoints = np.ones_like(bins)*self.rasterYslots[ypoints[0]]
              x = np.append(x, bins)
              y = np.append(y, ypoints)
              self.rasterPlot.setData(x, y)