diff --git a/PARAM_DEF/bepi_mercury4_r.xml b/PARAM_DEF/bepi_mercury4_r.xml
new file mode 100644
index 0000000..f25194c
--- /dev/null
+++ b/PARAM_DEF/bepi_mercury4_r.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<param xml:id="bepi_mercury4_r">
+	<get>
+		<vi name="bepi:orb:mercury4">
+			<baseParam name="R_IAU_MERCURY"/>
+		</vi>
+	</get>
+	<process>$bepi_orb_mercury4_R_IAU_MERCURY/RADIUS_MERCURY</process>
+	<output/>
+</param>
diff --git a/PARAM_DEF/bepi_xyz_mso4.xml b/PARAM_DEF/bepi_xyz_mso4.xml
new file mode 100644
index 0000000..66d008e
--- /dev/null
+++ b/PARAM_DEF/bepi_xyz_mso4.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<param xml:id="bepi_xyz_mso4">
+	<get>
+		<vi name="bepi:orb:mercury4">
+			<baseParam name="BC_MSO"/>
+		</vi>
+	</get>
+	<process>$bepi_orb_mercury4_BC_MSO/RADIUS_MERCURY</process>
+	<output/>
+</param>
diff --git a/PARAM_DEF/lat_bepi_mercury4.xml b/PARAM_DEF/lat_bepi_mercury4.xml
new file mode 100644
index 0000000..eaa3da4
--- /dev/null
+++ b/PARAM_DEF/lat_bepi_mercury4.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<param xml:id="lat_bepi_mercury4">
+	<get>
+		<vi name="bepi:orb:mercury4">
+			<baseParam name="LAT_IAU_MERCURY"/>
+		</vi>
+	</get>
+	<process>$bepi_orb_mercury4_LAT_IAU_MERCURY*RAD2DEG</process>
+	<output/>
+</param>
diff --git a/PARAM_DEF/lon_bepi_mercury4.xml b/PARAM_DEF/lon_bepi_mercury4.xml
new file mode 100644
index 0000000..6bbe0a2
--- /dev/null
+++ b/PARAM_DEF/lon_bepi_mercury4.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<param xml:id="lon_bepi_mercury4">
+	<get>
+		<vi name="bepi:orb:mercury4">
+			<baseParam name="LON_IAU_MERCURY"/>
+		</vi>
+	</get>
+	<process>$bepi_orb_mercury4_LON_IAU_MERCURY*RAD2DEG</process>
+	<output/>
+</param>
--
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