Hello hps-java, I am trying to get the track state for a GBL track at the calorimeter face. I get the GBL tracks as normal: List<Track> tracks = null; > if(event.hasCollection(Track.class, "GBLTracks")) { > tracks = event.get(Track.class, "GBLTracks"); > } else { > tracks = new ArrayList<Track>(0); > } I then attempt to get a track state: for(Track track : tracks) { > double[] p = > track.getTrackStates().get(TrackState.AtCalorimeter).getMomentum(); > System.out.printf("p = <%5.3f, %5.3f, %5.3f%n", p[0], p[1], p[2]); > } However, I get this error: java.lang.IndexOutOfBoundsException: Index 4 out-of-bounds for length 3 It seems that the track does not have the track state for the calorimeter stored. Am I doing something wrong? Thanks, Kyle ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1