diff --git a/Tools/TimePlot/Plots.hs b/Tools/TimePlot/Plots.hs
--- a/Tools/TimePlot/Plots.hs
+++ b/Tools/TimePlot/Plots.hs
@@ -122,14 +122,20 @@
     (\tfs -> plotTrackBars tfs binTitles name colors) <$>
     I.collect
   where
-    binTitles = [low]++[show v1++".."++show v2 
+    binTitles = [low]++[showDt v1++".."++showDt v2 
                        | v1 <- valueBinBounds 
                        | v2 <- tail valueBinBounds]++
                 [high]
       where
-        low = "<"++show (head valueBinBounds)
-        high = ">"++show (last valueBinBounds)
+        low = "<"++showDt (head valueBinBounds)
+        high = ">"++showDt (last valueBinBounds)
 
+-- 0.1s but 90ms, etc.
+showDt t | t < 0.0000001 = show (t*1000000000) ++ "ns"
+         | t < 0.0001    = show (t*1000000) ++ "us"
+         | t < 0.1       = show (t*1000) ++ "ms"
+         | True          = show t ++ "s"
+
 genBinHist :: NominalDiffTime -> [Double] -> PlotGen
 genBinFreqs :: NominalDiffTime -> [Double] -> PlotGen
 (genBinHist,genBinFreqs) = (genByBins values2binHist, genByBins values2binFreqs)
@@ -277,7 +283,7 @@
         !m' = fmap (\(_,_,nopen,_) -> (0,t2,nopen,0)) m
 
     step ev@(t, s, e) st@(m, t1:t2:ts, r)
-      | t < t1  = error "Times are not in ascending order"
+      | t < t1  = error $ "Times are not in ascending order, first violating is " ++ show t
       | t >= t2 = step ev (flushBin st)
       | True    = step'' ev st
 
diff --git a/Tools/TimePlot/Render.hs b/Tools/TimePlot/Render.hs
--- a/Tools/TimePlot/Render.hs
+++ b/Tools/TimePlot/Render.hs
@@ -14,14 +14,6 @@
 import Tools.TimePlot.Types
 import Tools.TimePlot.Plots
 
-mapAxisData :: (a -> b) -> (b -> a) -> AxisData b -> AxisData a
-mapAxisData f f' (AxisData vp pv ticks labels grid) = AxisData 
-    (\range x -> vp range (f x)) 
-    (\range v -> f' (pv range v)) 
-    (map (\(x,t) -> (f' x, t)) ticks) 
-    (map (map (\(x,lab) -> (f' x, lab))) labels) 
-    (map f' grid)
-
 dataToPlot :: AxisData LocalTime -> (LocalTime,LocalTime) -> PlotData -> AnyLayout1 LocalTime
 dataToPlot commonTimeAxis tr = dataToPlot' commonTimeAxis . constrainTime tr
 
diff --git a/timeplot.cabal b/timeplot.cabal
--- a/timeplot.cabal
+++ b/timeplot.cabal
@@ -1,5 +1,5 @@
 name: timeplot
-version: 1.0.18
+version: 1.0.19
 cabal-version: >=1.6
 build-type: Simple
 license: BSD3