diff --git a/NumericalData/AMDA/MEX/ephemeris/mex-orb-all.xml b/NumericalData/AMDA/MEX/ephemeris/mex-orb-all.xml
index 73f8f83..69018d4 100644
--- a/NumericalData/AMDA/MEX/ephemeris/mex-orb-all.xml
+++ b/NumericalData/AMDA/MEX/ephemeris/mex-orb-all.xml
@@ -40,13 +40,17 @@
                 <StopDate>2017-04-30T01:56:06Z</StopDate>
             </TimeSpan>
             <Cadence>PT60S</Cadence>
-        </TemporalDescription>
+        </TemporalDescription>      
         <Parameter>
             <Name>xyz_mso</Name>
             <ParameterKey>mex_xyz</ParameterKey>
             <Description>Mars Express trajectory in MSO coordinates</Description>
             <Ucd>pos.bodyrc;instr.obsty</Ucd>
             <Units>Rm</Units>
+            <CoordinateSystem>
+                <CoordinateRepresentation>Cartesian</CoordinateRepresentation>
+                <CoordinateSystemName>MSO</CoordinateSystemName>
+            </CoordinateSystem>
             <RenderingHints>
                 <DisplayType>TimeSeries</DisplayType>
             </RenderingHints>
@@ -54,17 +58,17 @@
                 <Size>3</Size>
                 <Element>
                     <Name>x</Name>
-                    <Index>0</Index>
+                    <Index>1</Index>
                     <ParameterKey>mex_xyz(0)</ParameterKey>
                 </Element>
                 <Element>
                     <Name>y</Name>
-                    <Index>1</Index>
+                    <Index>2</Index>
                     <ParameterKey>mex_xyz(1)</ParameterKey>
                 </Element>
                 <Element>
                     <Name>z</Name>
-                    <Index>2</Index>
+                    <Index>3</Index>
                     <ParameterKey>mex_xyz(2)</ParameterKey>
                 </Element>
             </Structure>
--
libgit2 0.21.2