Mako/Systems/engine-nozzle.xml

<?xml version="1.0" encoding="utf-8"?>

<PropertyList>

 <filter>
  <name>Engine Nozzle Area</name>
  <debug>false</debug>
  <type>gain</type>
  <input>
	<value>180.0</value>
  </input>
  <reference>
   	<property>engines/engine[0]/n1</property>
	<scale>1.5</scale>
  </reference>
  <output>
   <property>engines/engine/nozzle-pos-norm</property>
  </output>
  <gain>
   <expression>
    <table>
     <property>engines/engine[0]/afterburner</property>
     <entry><ind>0</ind><dep>0.01</dep></entry>
     <entry><ind>1</ind><dep>1.0</dep></entry>
    </table>
   </expression>
  </gain>
  <u_min>0.0</u_min>
  <u_max>1.0</u_max>
 </filter>

</PropertyList>