diff --git a/system/plots.py b/system/plots.py
index a0a5bd8..cbbddfc 100644
--- a/system/plots.py
+++ b/system/plots.py
@@ -449,7 +449,7 @@ class ScatterPlot(Plot):
         
         self.xaxis_data = dataset_1._array[:,x_index]
         self.yaxis_data = dataset_2._array[:,y_index]
-        ax.plot(self.xaxis_data,self.yaxis_data,'og')
+        ax.plot(self.xaxis_data,self.yaxis_data,'o',markeredgewidth=0)
         ax.set_title(self.get_title())
         ax.set_xlabel("%s - %s" % (sel_dim, id_1))
         ax.set_ylabel("%s - %s" % (sel_dim, id_2))
@@ -490,9 +490,10 @@ class ScatterPlot(Plot):
         index = self.dataset_1.get_indices(self.current_dim, ids)
         xdata_new = scipy.take(self.xaxis_data, index) #take data
         ydata_new = scipy.take(self.yaxis_data, index)
-        self.ax.clear()
-        self.ax.plot(self.xaxis_data,self.yaxis_data,'og')
-        self.ax.plot(xdata_new,ydata_new,'or')
+        #remove old selection
+        if len(self.ax.lines)>1:
+            del self.ax.lines[-1]
+        self.ax.plot(xdata_new,ydata_new,'ok')
         self.canvas.draw()
 
 class NetworkPlot(Plot):