"grr v time
0.0000000000000	1.0000000000000
0.4000000000000	1.0002257376834
0.8000000000000	1.0009445448227
1.2000000000000	1.0021989343887
1.6000000000000	1.0040507452258
2.0000000000000	1.0065709831260