time	zsurf	v
  608400.000	      -0.318	       0.003
  612000.000	      -0.451	       0.004
  615600.000	      -0.542	       0.002
  619200.000	      -0.526	       0.002
  622800.000	      -0.475	       0.003
  626400.000	      -0.396	       0.004
  630000.000	      -0.341	       0.001
  633600.000	      -0.262	       0.004
  637200.000	      -0.164	       0.003
  640800.000	      -0.138	       0.006
  644400.000	      -0.092	       0.007
  648000.000	      -0.024	       0.006
  651600.000	       0.011	       0.006
  655200.000	       0.029	       0.006
  658800.000	       0.046	       0.005
  662400.000	       0.041	       0.005
  666000.000	       0.018	       0.005
  669600.000	       0.001	       0.005
  673200.000	      -0.007	       0.004
  676800.000	      -0.011	       0.004
  680400.000	      -0.010	       0.004
  684000.000	      -0.008	       0.003
  687600.000	      -0.005	       0.003
  691200.000	      -0.003	       0.003
  694800.000	      -0.003	       0.003
  698400.000	      -0.004	       0.003
  702000.000	      -0.004	       0.002
  705600.000	      -0.005	       0.002
  709200.000	      -0.005	       0.002
  712800.000	      -0.005	       0.002
  716400.000	      -0.005	       0.002
  720000.000	      -0.004	       0.002
  723600.000	      -0.004	       0.002
  727200.000	      -0.003	       0.002
  730800.000	      -0.003	       0.001
  734400.000	      -0.002	       0.001