updated notes

main.py

@@ -79,7 +79,7 @@ def prob(df, d_array):
 NGC_2506= constrain_cl('NGC_2506')
 
 
-# we create a color-magnitude diagram with the apparent G magnitude in the Y-axis and the BP minus RP colour in the X-axis
+# we create a color-magnitude diagram with the apparent G magnitude in the Y-axis and the BP-RP colour in the X-axis
 
 sns.set_style('darkgrid')
 plt.figure()
@@ -221,4 +221,4 @@ def prob(df, d_array):
 giant branch). For NGC2506 cluster, we can clearly see the cut-off (around $Absolute_{G} =2$) on the main-sequence and a number of stars that have already
 been evolved off towards later evolutionary stages. On the other hand, cluster NGC2168 still contains hotter, brighter and more massive stars (top left 
 corner of the diagram), thus we can conclude that NGC2506 is older than NGC2168.
-'''
+'''