diff --git a/src/projections/Tools/Extrema/ExtremaWindow.java b/src/projections/Tools/Extrema/ExtremaWindow.java
index 4316ecb..056adf4 100644
--- a/src/projections/Tools/Extrema/ExtremaWindow.java
+++ b/src/projections/Tools/Extrema/ExtremaWindow.java
@@ -123,6 +123,11 @@ public class ExtremaWindow extends GenericGraphWindow
 	private double[][] graphData;
 	private LinkedList<Integer> outlierPEs;
 
+	// The time range the loaded data covers, for the chart header; the x axis
+	// shows PEs, so nothing else on the chart says what interval was analyzed.
+	private long loadedStartTime;
+	private long loadedEndTime;
+
 
 	public ExtremaWindow(MainWindow mainWindow) {
 		super("Projections Extrema Analysis Tool - " + 
@@ -290,6 +295,8 @@ public Paint[] getColorMap() {
 	private GenericGraphColorer colorer;
 
 	private void constructToolData(final  long startTime, final long endTime ) {
+		loadedStartTime = startTime;
+		loadedEndTime = endTime;
 		// construct the necessary meta-data given the selected activity
 		// type.
 		double[][] tempData;
@@ -795,7 +802,9 @@ public void done() {
 	// outlier analysis which will then determine which processor's
 	// log data to read.
 	private void readOutlierStats(final long startTime, final long endTime) {
-		numActivities = MainWindow.runObject[myRun].getNumActivity(selectedActivity); 
+		loadedStartTime = startTime;
+		loadedEndTime = endTime;
+		numActivities = MainWindow.runObject[myRun].getNumActivity(selectedActivity);
 
 		colorer = new OnlineDataColorer(numActivities);
 		
@@ -943,11 +952,18 @@ private void readOnlineOutlierProcessor(int pe, int index, final long startTime,
 
 	protected void setGraphSpecificData() {
 		setXAxis("Notable PEs (Cluster Representatives and Extrema)", outlierList);
-		setYAxis(attributes[1][selectedAttribute], 
+		setYAxis(attributes[1][selectedAttribute],
 				attributes[2][selectedAttribute]);
 		setDataSource("Extrema: " + attributes[0][selectedAttribute] +
-				" (" + threshold + 
+				" (" + threshold +
 				" Extrema PEs)", graphData, colorer, this);
+		// Flank the chart title with the analyzed time range and PE selection;
+		// neither is visible anywhere else on this chart.
+		SortedSet<Integer> selectedPEs =
+			(dialog != null) ? new TreeSet<Integer>(dialog.getSelectedProcessors()) : null;
+		graphCanvas.setTitleAnnotations(
+				"Time " + U.humanReadableRange(loadedStartTime, loadedEndTime),
+				Util.processorSelectionString(selectedPEs));
 		refreshGraph();
 	}
 
diff --git a/src/projections/gui/ProfileWindow.java b/src/projections/gui/ProfileWindow.java
index 3515ea0..4465ee0 100644
--- a/src/projections/gui/ProfileWindow.java
+++ b/src/projections/gui/ProfileWindow.java
@@ -511,8 +511,11 @@ private void setDisplayProfileData(){
 
 
         String[] gTitles = new String[2];
-        gTitles[0] = "Profile of Usage for Processors "+Util.listToString(data.plist);
-        gTitles[1] = "(Time "+data.begintime/(float)1000+" ~ "+data.endtime/(float)1000+" ms)";
+        // Strided form ("0-115:5"), not the expanded list: at large PE counts
+        // the expanded list is wider than the canvas, pushing everything that
+        // identifies the chart (including the time range below) out of sight.
+        gTitles[0] = "Profile of Usage for "+Util.processorSelectionString(data.plist);
+        gTitles[1] = "(Time "+U.humanReadableRange(data.begintime, data.endtime)+")";
         displayCanvas.setGraphTiltes(gTitles);
 
         String[] xNames = new String[data.plist.size()+1];
diff --git a/src/projections/gui/U.java b/src/projections/gui/U.java
index dea7ff4..9587234 100644
--- a/src/projections/gui/U.java
+++ b/src/projections/gui/U.java
@@ -94,4 +94,23 @@ public static String humanReadableString(long us, int places)
 	return (int)(us/1000000)+printDecimals(us*0.000001,places)+"s";
     }
 
+    /*
+      A time range for a chart header: "start - end" with at most 3 decimal
+      places, adding digits only when the range is so narrow that the two
+      endpoints would otherwise print alike. Six decimals of a seconds value
+      is exact microseconds, so distinct endpoints always separate.
+    */
+    public static String humanReadableRange(long startUs, long endUs)
+    {
+	int places = 3;
+	String start = humanReadableString(startUs, places);
+	String end = humanReadableString(endUs, places);
+	while (start.equals(end) && startUs != endUs && places < 6) {
+	    places++;
+	    start = humanReadableString(startUs, places);
+	    end = humanReadableString(endUs, places);
+	}
+	return start + " - " + end;
+    }
+
 }