diff --git a/system/plots.py b/system/plots.py
index d466ca4..fb9edb8 100644
--- a/system/plots.py
+++ b/system/plots.py
@@ -383,7 +383,7 @@ class LinePlot(Plot):
         self.ax.clear()
         
         rows, cols = self._bg_matrix.shape
-        self.ax.imshow(self._bg_matrix, cmap=cm.gray, extent=(0.5, cols+0.5, self._ymin, self._ymax))
+        self.ax.imshow(self._bg_matrix, cmap=cm.Greys, extent=(0.5, cols+0.5, self._ymin, self._ymax))
 
         if self.project:
             curr_sel = self.project.get_selection() # get selection object