Wind Plugin for wind along both x and y axes

I am trying to use the wind plugin. I have added the following lines of code to the world file.

`<!-- Wind Plugin -->
<plugin name='wind_plugin' filename=''>
  <windDirectionMean>1 0 0</windDirectionMean>
  <windGustDirectionMean>1 0 0</windGustDirectionMean>

I wanted to simulate wind with velocity 3 m/s along x-axis and 4 m/s along y-axis.
How should I modify the code of the wind plugin to achieve this. Also I wanted to ask whether the wind velocities are in m/s?