I have a input file named file.txt with the contents
Zone
1.0 2.0 3.0
2.0 3.0 4.0
1.0 2.0 3.0
2.0 3.0 4.0
1.0 2.0 3.0
2.0 3.0 4.0
1.0 2.0 3.0
2.0 3.0 4.0