Hi ,
Not at all.
The point is that I am selecting a range , you are selecting a whole column.
When you select a column , you are selecting a range , and the range is the whole column ; if you select column H , then the range is H1:H1048576.
And now if you uncheck the box My data contains headers , essentially you are telling Excel that your headers in row 1 are also a part of the data.
If you select the whole column , you have to check the box My data contains headers.
Narayan