Index: trunk/ippToPsps/config/tables.DF.vot
===================================================================
--- trunk/ippToPsps/config/tables.DF.vot	(revision 39037)
+++ trunk/ippToPsps/config/tables.DF.vot	(revision 39043)
@@ -259,27 +259,27 @@
 	<DESCRIPTION>Number of difference pixels within the aperture that are positive.</DESCRIPTION>
       </FIELD>
-      <FIELD name="diffFRatio" arraysize="1" datatype="float" unit="dimensionless" default="-999">
-	<DESCRIPTION>Fraction of unmasked flux within the aperture that is positive.</DESCRIPTION>
-      </FIELD>
-      <FIELD name="diffNBad" arraysize="1" datatype="float" unit="dimensionless" default="-999">
-	<DESCRIPTION>Fraction of unmasked difference pixels within the aperture that are positive.</DESCRIPTION>
-      </FIELD>
-      <FIELD name="diffNMask" arraysize="1" datatype="float" unit="dimensionless" default="-999">
-	<DESCRIPTION>Fraction difference pixels within the aperture that are positive asdfasdfasdfsdfs.</DESCRIPTION>
-      </FIELD>
-      <FIELD name="diffNAll" arraysize="1" datatype="float" unit="dimensionless" default="-999">
-	<DESCRIPTION>Fraction of all difference pixels within the aperture that are positive.</DESCRIPTION>
+      <FIELD name="diffFPosRatio" arraysize="1" datatype="float" unit="dimensionless" default="-999">
+	<DESCRIPTION>Ratio of the sum of positive flux pixel values to the sum of the absolute value of all unmasked pixel within the aperture.</DESCRIPTION>
+      </FIELD>
+      <FIELD name="diffNPosRatio" arraysize="1" datatype="float" unit="dimensionless" default="-999">
+	<DESCRIPTION>Ratio of the number of positive flux pixels to the number of unmasked pixels within the aperture.</DESCRIPTION>
+      </FIELD>
+      <FIELD name="diffNPosMask" arraysize="1" datatype="float" unit="dimensionless" default="-999">
+	<DESCRIPTION>Ratio of the number of positive flux pixels to the number of positive or masked pixels within the aperture</DESCRIPTION>
+      </FIELD>
+      <FIELD name="diffNPosAll" arraysize="1" datatype="float" unit="dimensionless" default="-999">
+	<DESCRIPTION>Ratio of the number of positive flux pixels to the total number of all pixels within the aperture.</DESCRIPTION>
       </FIELD>
       <FIELD name="diffPdist" arraysize="1" datatype="float" unit="sky pixels" default="-999">
-	<DESCRIPTION>Distance to matching positive source.</DESCRIPTION>
+	<DESCRIPTION>Distance to matching source in positive image.</DESCRIPTION>
       </FIELD>
       <FIELD name="diffNdist" arraysize="1" datatype="float" unit="sky pixels" default="-999">
-	<DESCRIPTION>Distance to matching negative source.</DESCRIPTION>
+	<DESCRIPTION>Distance to matching source in negative image.</DESCRIPTION>
       </FIELD>
       <FIELD name="diffPSN" arraysize="1" datatype="float" unit="dimensionless" default="-999">
-	<DESCRIPTION>Signal to noise of matching positive source.</DESCRIPTION>
+	<DESCRIPTION>Signal to noise of matching source in positive image.</DESCRIPTION>
       </FIELD>
       <FIELD name="diffNSN" arraysize="1" datatype="float" unit="dimensionless" default="-999">
-	<DESCRIPTION>Signal to noise of matching negative source.</DESCRIPTION>
+	<DESCRIPTION>Signal to noise of matching source in negative image.</DESCRIPTION>
       </FIELD>
       <FIELD name="Dsky" arraysize="1" datatype="float" unit="Janskys/arcsec^2" default="-999">