Editing the question:
I have two DataFrames of different sizes, they are:
df1 = pd.DataFrame({'bc': bc_1}, index=altura_1)
df1.shape()=(73,1)
>>> print df1
bc
1.175441 0.002884
1.115565 0.001905
1.055689 0.003029
0.995812 0.003366
.
.
.
df2 = pd.DataFrame({'bc': bc_2}, index=altura_2)
df2.shape()=(18,1)
>>> print df2
bc
0.150 0.000005
0.165 0.000007
0.180 0.000010
.
.
.
And they're measuring the same variable, only using two different instruments.
The graph representing this data is as follows:
Do you realize that in some moments, the curves (the points) are very close? I need to figure out what these points are and store them in another dataframe