diff --git a/measure-routes.rkt b/measure-routes.rkt
index e5cbd53..811d259 100644
--- a/measure-routes.rkt
+++ b/measure-routes.rkt
@@ -20,7 +20,10 @@
 			      #:column-spec '(number-of-entries
 					      positive-probes-per-second
 					      negative-probes-per-second
-					      large-positive-per-second)))
+					      large-positive-per-second
+                                              seconds-per-positive-probe
+                                              seconds-per-negative-probe
+                                              seconds-per-large-positive)))
 
 (define *the-routes* #f)
 (define *count* 0)
@@ -56,7 +59,10 @@
   (write-logbook-datum! Tprobe (list *count*
 				     positive-probes-per-second
 				     negative-probes-per-second
-				     large-positive-per-second)))
+				     large-positive-per-second
+                                     (/ positive-probes-per-second)
+                                     (/ negative-probes-per-second)
+                                     (/ large-positive-per-second))))
 
 (record-datapoint!)
 (let loop ((next-count 1000))