Attributes {
    z {
        Float64 _FillValue NaN;
    }
    vel1 {
        Float64 _FillValue NaN;
    }
    vel2 {
        Float64 _FillValue NaN;
    }
    vel3 {
        Float64 _FillValue NaN;
    }
    Date {
        Float64 _FillValue NaN;
        String units "seconds since 2014-09-16 08:00:00";
        String calendar "proleptic_gregorian";
    }
}