data["dens"][0]
Out[80]: 562

data["dens"][0:3]
Out[81]: 
0    562
1    101
2     19
Name: dens, dtype: int64

data.dens[0:3]
Out[82]: 
0    562
1    101
2     19
Name: dens, dtype: int64
data["dens"].sort_values()
Out[84]: 
11593        0
22300        0
21144        0
3800         0
1577         0
 
35923    23476
36009    24343
36021    25377
35952    25778
35919    26660
Name: dens, Length: 36568, dtype: int64