fixed interface for PID method.

diff --git a/src/jalview/util/Comparison.java b/src/jalview/util/Comparison.java
index becfe08..3a831d0 100755 (executable)
--- a/src/jalview/util/Comparison.java
+++ b/src/jalview/util/Comparison.java
@@ -53,7 +53,7 @@ public class Comparison {
   }\r
 \r
   /**    */\r
-  public static float PID(Sequence s1 , Sequence s2)\r
+  public static float PID(SequenceI s1 , SequenceI s2)\r
   {\r
     int len;\r
 \r