time	zsurf	v
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  838800.000	      -0.065	       0.011
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  846000.000	      -0.088	       0.011
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  860400.000	      -0.134	       0.010
  864000.000	      -0.142	       0.007
  867600.000	      -0.145	       0.007
  871200.000	      -0.140	       0.014
  874800.000	      -0.122	       0.014
  878400.000	      -0.110	       0.006
  882000.000	      -0.114	       0.005
  885600.000	      -0.111	       0.009
  889200.000	      -0.082	       0.025
  892800.000	      -0.042	       0.023
  896400.000	      -0.021	       0.010
  900000.000	      -0.024	       0.017
  903600.000	      -0.029	       0.012
  907200.000	      -0.022	       0.011
  910800.000	      -0.004	       0.014
  914400.000	       0.009	       0.011
  918000.000	       0.007	       0.015
  921600.000	      -0.002	       0.014
  925200.000	      -0.004	       0.009
  928800.000	       0.001	       0.008
  932400.000	       0.003	       0.008
  936000.000	      -0.000	       0.008
  939600.000	      -0.005	       0.006
  943200.000	      -0.007	       0.001
  946800.000	      -0.005	       0.004
  950400.000	      -0.004	       0.006
  954000.000	      -0.005	       0.007
  957600.000	      -0.009	       0.008
  961200.000	      -0.014	       0.008
  964800.000	      -0.018	       0.009
  968400.000	      -0.020	       0.010
  972000.000	      -0.022	       0.009
  975600.000	      -0.023	       0.010
  979200.000	      -0.023	       0.009
  982800.000	      -0.025	       0.008
  986400.000	      -0.028	       0.008
  990000.000	      -0.030	       0.008
  993600.000	      -0.032	       0.008