How to make a list from DataFrame?


I have a DataFrame (coordinates):



    X   Y   Z
0 11 44 77
1 22 55 88
2 33 66 99


I need to get Y and Z columns values to a list.
If I do something like:



centers = [df['Y'], df['Z']]


or



Y = [df['Y']]


I got a list with index columns like:



print Y

0 44
1 55
2 66


How to create a list without indexes values (0,1,2)?


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