time	zsurf	v
  835200.000	      -0.052	       0.036
  838800.000	      -0.061	       0.036
  842400.000	      -0.073	       0.036
  846000.000	      -0.085	       0.037
  849600.000	      -0.098	       0.037
  853200.000	      -0.111	       0.036
  856800.000	      -0.122	       0.034
  860400.000	      -0.131	       0.029
  864000.000	      -0.138	       0.019
  867600.000	      -0.140	       0.002
  871200.000	      -0.136	       0.023
  874800.000	      -0.124	       0.030
  878400.000	      -0.116	       0.020
  882000.000	      -0.118	       0.016
  885600.000	      -0.112	       0.019
  889200.000	      -0.083	       0.038
  892800.000	      -0.044	       0.041
  896400.000	      -0.022	       0.031
  900000.000	      -0.025	       0.031
  903600.000	      -0.031	       0.028
  907200.000	      -0.024	       0.028
  910800.000	      -0.005	       0.033
  914400.000	       0.008	       0.028
  918000.000	       0.006	       0.023
  921600.000	      -0.003	       0.020
  925200.000	      -0.004	       0.017
  928800.000	      -0.000	       0.017
  932400.000	       0.002	       0.013
  936000.000	      -0.001	       0.009
  939600.000	      -0.006	       0.006
  943200.000	      -0.007	       0.000
  946800.000	      -0.005	       0.005
  950400.000	      -0.004	       0.007
  954000.000	      -0.005	       0.010
  957600.000	      -0.009	       0.013
  961200.000	      -0.014	       0.015
  964800.000	      -0.018	       0.015
  968400.000	      -0.020	       0.015
  972000.000	      -0.022	       0.015
  975600.000	      -0.023	       0.015
  979200.000	      -0.022	       0.015
  982800.000	      -0.024	       0.015
  986400.000	      -0.028	       0.014
  990000.000	      -0.030	       0.013
  993600.000	      -0.032	       0.013