<?xml version='1.0' encoding='us-ascii'?>
<param xml:id="solo_b_rtn_phi">
    <get>
      <amdaParam name="solo_b_rtn" />
    </get>
    <process>180+RAD2DEG*atan2(-$solo_b_rtn[1],-$solo_b_rtn[0])</process>
    <output />
  </param>