diff --git a/data/runtime.data b/data/runtime.data
new file mode 100644
--- /dev/null
+++ b/data/runtime.data
@@ -0,0 +1,52 @@
+#description: runtimes over input size
+1		6.355182636689504e-5
+100		1.0948364162371856e-2
+199		2.2883437011933076e-2
+298		3.6984818514001545e-2
+397		5.278430392525412e-2
+496		6.556876441607734e-2
+595		8.094012753488622e-2
+694		9.764933499422945e-2
+793		0.11376420890800729
+892		0.1303682446197088
+991		0.1494559487429532
+1090		0.16847618759261968
+1189		0.1870789716535227
+1288		0.20706133347400274
+1387		0.22577923641544467
+1486		0.24842725050880543
+1585		0.2687356359522487
+1684		0.29853175822408823
+1783		0.30569358846083045
+1882		0.34811570598277525
+1981		0.37377121156830634
+2080		0.3976917936986544
+2179		0.4248938615564355
+2278		0.4563135662584595
+2377		0.4827751635322885
+2476		0.5078150705665049
+2575		0.5308599307954707
+2674		0.5731755964461464
+2773		0.5953289658030824
+2872		0.6123024067073677
+2971		0.5644368814660525
+3070		0.6892736894713817
+3169		0.7198984790477585
+3268		0.75820146082337
+3367		0.7922666002868061
+3466		0.8332174605827827
+3565		0.8727248373231685
+3664		0.9070082204645331
+3763		0.941051246582755
+3862		0.9763012261824174
+3961		1.0146614115691386
+4060		1.053540654379474
+4159		1.1035736989768552
+4258		1.1434341162864607
+4357		1.1855544921484864
+4456		0.935738517553156
+4555		1.2367099547145342
+4654		1.2909424329951484
+4753		1.3264400538531225
+4852		1.3685529705611144
+4951		1.4105760332671073
diff --git a/gnuplot.cabal b/gnuplot.cabal
--- a/gnuplot.cabal
+++ b/gnuplot.cabal
@@ -1,5 +1,5 @@
 Name:             gnuplot
-Version:          0.4
+Version:          0.4.0.1
 License:          BSD3
 License-File:     LICENSE
 Author:           Henning Thielemann <haskell@henning-thielemann.de>
@@ -36,6 +36,8 @@
   execute/tmp/Graphics/Gnuplot/Execute.hs
   execute/pipe/Graphics/Gnuplot/Execute.hs
   execute/shell/Graphics/Gnuplot/Execute.hs
+Data-Files:
+  data/runtime.data
 
 Flag splitBase
   description: Choose the new smaller, split-up base package.
@@ -122,7 +124,9 @@
     Graphics.Gnuplot.Terminal
 
 Executable gnuplot-demo
-  If !flag(buildExamples)
+  If flag(buildExamples)
+    Build-Depends: filepath >=1.1 && <1.2
+  Else
     Buildable: False
   GHC-Options: -Wall
   Hs-Source-Dirs: src, execute/tmp
diff --git a/src/Demo.hs b/src/Demo.hs
--- a/src/Demo.hs
+++ b/src/Demo.hs
@@ -18,8 +18,13 @@
 import qualified Graphics.Gnuplot.Graph.TwoDimensional as Graph2D
 import Graphics.Gnuplot.Plot.TwoDimensional (linearScale, )
 
+import qualified Graphics.Gnuplot.LineSpecification as LineSpec
+
 import qualified Data.Time as Time
 
+import qualified Paths_gnuplot as Path
+import System.FilePath ((</>), )
+
 import Data.Array (listArray, )
 import Data.Monoid (mappend, )
 
@@ -53,6 +58,21 @@
    `mappend`
    circle2d
 
+file2d :: FilePath -> FilePath -> Frame.T (Graph2D.T Int Double)
+file2d path file =
+   let lineSpec =
+          Graph2D.lineSpec $
+          LineSpec.title "runtimes" $
+          LineSpec.lineWidth 2.5 $
+          LineSpec.deflt
+       frameOpts =
+          Opts.xLabel "input size" $
+          Opts.yLabel "runtime (ms)" $
+          Opts.title ("Graph from " ++ file) $
+          Opts.deflt
+   in  Frame.cons frameOpts $ fmap lineSpec $
+       Plot2D.pathFromFile Graph2D.lines (path </> file) 1 2
+
 mixed2d :: MultiPlot.T
 mixed2d =
    MultiPlot.simpleFromPartArray $
@@ -123,6 +143,8 @@
       Plot.plot X11.cons list2d
       Plot.plot X11.cons candle2d
       Plot.plot X11.cons overlay2d
+      Plot.plot X11.cons . flip file2d "runtime.data"
+         =<< fmap (</> "data") Path.getDataDir
       Plot.plot X11.cons mixed2d
       Plot.plot X11.cons size2d
       Plot.plot X11.cons wave3d
diff --git a/src/Graphics/Gnuplot/Plot/TwoDimensional.hs b/src/Graphics/Gnuplot/Plot/TwoDimensional.hs
--- a/src/Graphics/Gnuplot/Plot/TwoDimensional.hs
+++ b/src/Graphics/Gnuplot/Plot/TwoDimensional.hs
@@ -30,6 +30,7 @@
 
 {- |
 Plots can be assembled using 'mappend' or 'mconcat'.
+You can alter attributes of embedded graphs using 'fmap'.
 -}
 type T x y = Plot.T (Graph.T x y)
 
diff --git a/src/Graphics/Gnuplot/Private/Graph2D.hs b/src/Graphics/Gnuplot/Private/Graph2D.hs
--- a/src/Graphics/Gnuplot/Private/Graph2D.hs
+++ b/src/Graphics/Gnuplot/Private/Graph2D.hs
@@ -75,5 +75,8 @@
 typ :: Type -> T x y -> T x y
 typ t gr = gr{type_ = t}
 
+{- |
+You can alter the line specification of graphs in a plot using 'fmap'.
+-}
 lineSpec :: LineSpec.T -> T x y -> T x y
 lineSpec ls gr = gr{lineSpec_ = ls}