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diff --git a/gr-trellis/grc/trellis_metrics_x.xml b/gr-trellis/grc/trellis_metrics_x.xml
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+<?xml version="1.0"?>
+<!--
+###################################################
+##Trellis Metrics
+###################################################
+ -->
+
+
+<block>
+	<name>Trellis Metrics</name>
+	<key>trellis_metrics_x</key>
+	<category>Error Correction/Trellis</category>
+	<import>from gnuradio import trellis</import>
+	<make>trellis.metrics_$(type)($card, $dim, $table, $metric_type)</make>
+	<callback>set_TABLE($table)</callback>
+	<param>
+		<name>Type</name>
+		<key>type</key>
+		<type>enum</type>
+		<option>
+			<name>Complex</name>
+			<key>c</key>
+			<opt>io:complex</opt>
+			<opt>table:complex_vector</opt>
+		</option>
+		<option>
+			<name>Float</name>
+			<key>f</key>
+			<opt>io:float</opt>
+			<opt>table:real_vector</opt>
+		</option>
+		<option>
+			<name>Int</name>
+			<key>i</key>
+			<opt>io:int</opt>
+			<opt>table:int_vector</opt>
+		</option>
+		<option>
+			<name>Short</name>
+			<key>s</key>
+			<opt>io:short</opt>
+			<opt>table:int_vector</opt>
+		</option>
+	</param>
+	<param>
+		<name>Output Cardinality</name>
+		<key>card</key>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Dimensionality</name>
+		<key>dim</key>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Constellation</name>
+		<key>table</key>
+		<type>$type.table</type>
+	</param>
+	<param>
+		<name>Metric Type</name>
+		<key>metric_type</key>
+		<type>enum</type>
+		<option>
+			<name>Euclidean</name>
+			<key>trellis.TRELLIS_EUCLIDEAN</key>
+		</option>
+		<option>
+			<name>Hard Symbol</name>
+			<key>trellis.TRELLIS_HARD_SYMBOL</key>
+		</option>
+		<option>
+			<name>Hard Bit</name>
+			<key>trellis.TRELLIS_HARD_BIT</key>
+		</option>
+	</param>
+	<sink>
+		<name>in</name>
+		<type>$type.io</type>
+	</sink>
+	<source>
+		<name>out</name>
+		<type>float</type>
+	</source>
+	<doc>
+Generate metrics required for Viterbi or SISO algorithms.
+	</doc>
+</block>