time	zsurf	v
  842400.000	      -0.065	       0.014
  846000.000	      -0.112	       0.014
  849600.000	      -0.125	       0.005
  853200.000	      -0.063	       0.024
  856800.000	       0.041	       0.026
  860400.000	       0.091	       0.007
  864000.000	       0.079	       0.007
  867600.000	       0.053	       0.009
  871200.000	       0.026	       0.009
  874800.000	       0.009	       0.003
  878400.000	       0.004	       0.005
  882000.000	      -0.017	       0.008
  885600.000	      -0.047	       0.011
  889200.000	      -0.080	       0.011
  892800.000	      -0.105	       0.008
  896400.000	      -0.122	       0.006
  900000.000	      -0.134	       0.005
  903600.000	      -0.146	       0.006
  907200.000	      -0.160	       0.006
  910800.000	      -0.172	       0.004
  914400.000	      -0.176	       0.002
  918000.000	      -0.173	       0.002
  921600.000	      -0.167	       0.002
  925200.000	      -0.162	       0.002
  928800.000	      -0.156	       0.003
  932400.000	      -0.148	       0.004
  936000.000	      -0.139	       0.004
  939600.000	      -0.129	       0.004
  943200.000	      -0.121	       0.004
  946800.000	      -0.113	       0.004
  950400.000	      -0.104	       0.004
  954000.000	      -0.095	       0.004
  957600.000	      -0.087	       0.004
  961200.000	      -0.080	       0.003
  964800.000	      -0.074	       0.003
  968400.000	      -0.069	       0.003
  972000.000	      -0.065	       0.002
  975600.000	      -0.061	       0.002
  979200.000	      -0.058	       0.002
  982800.000	      -0.054	       0.002
  986400.000	      -0.052	       0.002
  990000.000	      -0.050	       0.002
  993600.000	      -0.049	       0.001