I have a data of the form
0.0117843924 0. 0. 0. 0.
0.011036017 0. 0. 0. 0.
0.0103351669 0. 0. 0. 0.
4839.41211 0. 0. 0. 0.
4532.08203 0. 0. 0. 0.
I would like to insert a couple of blank lines before the 4839 line, every time it appears. The numbers in the first column follow the same pattern throughout the file, but the next 4 columns may change, so I can't just match the whole line.
Is there a neat way to do this, as I've had no luck with sed.