<param xml:id="vo1_b_juprtn_phi">
    <get>
      <amdaParam name="vo1_b_juprtn" />
    </get>
    <process>180+RAD2DEG*atan2(-$vo1_b_juprtn[1],-$vo1_b_juprtn[0])</process>
    <output />
  </param>