Transform 3 Columns into Single Column

[DaveG]

I Have a file comprising 3 columns of data and I would like to transform these columns into a single column, one following the other e.g. below. Could someone kindly tell me how to write the code to do this. It would be much appreciated and get me out of a bind.

3560181.703 -3384947.321 -5.02245
3560191.703 -3384947.321 -4.88665
3560201.703 -3384947.321 -4.76042

Reformat to:

3560181.703
3560191.703
3560201.703
-3384947.321
-3384947.321
-3384947.321
-5.02245
-4.88665
-4.76042