<?xml version="1.0"?>
<param xml:id="pho2_pho_r">
    <reference_parameter>pho_xyz_mso</reference_parameter>
    <get>
	<amdaParam name="pho_xyz_mso"/>
	<amdaParam name="xyz_phobos"/>
    </get>
    <process>magnitude($pho_xyz_mso-$xyz_phobos)*RADIUS_MARS</process>
    <output/>
</param>