"kxx v time
0.0000000000000	0.0000000000000
0.1000000000000	-1.3890166100507
0.2000000000000	-2.7787964186937
0.3000000000000	-4.1701016086115
0.4000000000000	-5.5636923164869
0.5000000000000	-6.9603255853867