diff --git a/garlic/ds/ctf/mode.py b/garlic/ds/ctf-mode.py
similarity index 100%
rename from garlic/ds/ctf/mode.py
rename to garlic/ds/ctf-mode.py
diff --git a/garlic/ds/ctf/mode.nix b/garlic/ds/ctf/mode.nix
deleted file mode 100644
index d3348eb..0000000
--- a/garlic/ds/ctf/mode.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  stdenv
-, python3
-, gzip
-}:
-
-resultTree:
-
-stdenv.mkDerivation {
-  name = "ctf-mode.json.gz";
-  preferLocalBuild = true;
-  src = ./mode.py;
-  phases = [ "unpackPhase" "installPhase" ];
-
-  unpackPhase = ''
-    cp $src mode.py
-  '';
-
-  buildInputs = [ python3 gzip ];
-  installPhase = ''
-    python mode.py ${resultTree} | gzip > $out
-  '';
-}
diff --git a/garlic/ds/index.nix b/garlic/ds/index.nix
index b0dc7ec..95cb388 100644
--- a/garlic/ds/index.nix
+++ b/garlic/ds/index.nix
@@ -6,17 +6,13 @@
 , callPackage
 }:
 
-{
-  std = {
-    timetable = callPackage ./std/timetable.nix {};
-  };
+rec {
 
-  osu = {
-    latency = callPackage ./osu/latency.nix {};
-    bw = callPackage ./osu/bw.nix {};
-  };
+  py = callPackage ./py.nix {};
 
-  perf.stat = callPackage ./perf/stat.nix {};
-
-  ctf.mode = callPackage ./ctf/mode.nix {};
+  std.timetable = py { script = ./std-timetable.py; compress = false; };
+  osu.latency = py { script = ./osu-latency.py; };
+  osu.bw = py { script = ./osu-bw.py; };
+  perf.stat = py { script = ./perf-stat.py; };
+  ctf.mode = py { script = ./ctf-mode.py; };
 }
diff --git a/garlic/ds/osu/bw.py b/garlic/ds/osu-bw.py
similarity index 100%
rename from garlic/ds/osu/bw.py
rename to garlic/ds/osu-bw.py
diff --git a/garlic/ds/osu/latency.py b/garlic/ds/osu-latency.py
similarity index 100%
rename from garlic/ds/osu/latency.py
rename to garlic/ds/osu-latency.py
diff --git a/garlic/ds/osu/bw.nix b/garlic/ds/osu/bw.nix
deleted file mode 100644
index 9426998..0000000
--- a/garlic/ds/osu/bw.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  stdenv
-, python3
-, gzip
-}:
-
-resultTree:
-
-stdenv.mkDerivation {
-  name = "osu-bw.json.gz";
-  preferLocalBuild = true;
-  src = ./bw.py;
-  phases = [ "unpackPhase" "installPhase" ];
-
-  unpackPhase = ''
-    cp $src bw.py
-  '';
-
-  buildInputs = [ python3 gzip ];
-  installPhase = ''
-    python bw.py ${resultTree} | gzip > $out
-  '';
-}
diff --git a/garlic/ds/osu/latency.nix b/garlic/ds/osu/latency.nix
deleted file mode 100644
index 3fe0426..0000000
--- a/garlic/ds/osu/latency.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  stdenv
-, python3
-, gzip
-}:
-
-resultTree:
-
-stdenv.mkDerivation {
-  name = "osu-latency.json.gz";
-  preferLocalBuild = true;
-  src = ./latency.py;
-  phases = [ "unpackPhase" "installPhase" ];
-
-  unpackPhase = ''
-    cp $src latency.py
-  '';
-
-  buildInputs = [ python3 gzip ];
-  installPhase = ''
-    python latency.py ${resultTree} | gzip > $out
-  '';
-}
diff --git a/garlic/ds/perf/stat.py b/garlic/ds/perf-stat.py
similarity index 100%
rename from garlic/ds/perf/stat.py
rename to garlic/ds/perf-stat.py
diff --git a/garlic/ds/perf/stat.nix b/garlic/ds/perf/stat.nix
deleted file mode 100644
index 14b55c4..0000000
--- a/garlic/ds/perf/stat.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  stdenv
-, python3
-, gzip
-}:
-
-resultTree:
-
-stdenv.mkDerivation {
-  name = "perf-stat.json.gz";
-  preferLocalBuild = true;
-  src = ./stat.py;
-  phases = [ "unpackPhase" "installPhase" ];
-
-  unpackPhase = ''
-    cp $src stat.py
-  '';
-
-  buildInputs = [ python3 gzip ];
-  installPhase = ''
-    python stat.py ${resultTree} | gzip > $out
-  '';
-}
diff --git a/garlic/ds/py.nix b/garlic/ds/py.nix
new file mode 100644
index 0000000..012a159
--- /dev/null
+++ b/garlic/ds/py.nix
@@ -0,0 +1,34 @@
+{
+  stdenv
+, python3
+, gzip
+}:
+
+{
+  script,
+  compress ? true
+}:
+
+tree:
+
+stdenv.mkDerivation {
+  name = "dataset";
+  preferLocalBuild = true;
+  phases = [ "installPhase" ];
+  buildInputs = [ python3 gzip ];
+  installPhase = ''
+    mkdir -p $out
+    ln -s ${tree} $out/tree
+    ln -s ${script} $out/script
+
+    COMPRESS_DATASET=${toString compress}
+
+    if [ $COMPRESS_DATASET ]; then
+      python $out/script $out/tree | gzip > $out/dataset.json.gz
+      ln -s dataset.json.gz $out/dataset
+    else
+      python $out/script $out/tree > $out/dataset.json
+      ln -s dataset.json $out/dataset
+    fi
+  '';
+}
diff --git a/garlic/ds/std/timetable.py b/garlic/ds/std-timetable.py
similarity index 100%
rename from garlic/ds/std/timetable.py
rename to garlic/ds/std-timetable.py
diff --git a/garlic/ds/std/timetable.nix b/garlic/ds/std/timetable.nix
deleted file mode 100644
index 496dc58..0000000
--- a/garlic/ds/std/timetable.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  stdenv
-, python3
-}:
-
-resultTree:
-
-stdenv.mkDerivation {
-  name = "timetable.json";
-  preferLocalBuild = true;
-  src = ./timetable.py;
-  phases = [ "unpackPhase" "installPhase" ];
-
-  unpackPhase = ''
-    cp $src timetable.py
-  '';
-
-  buildInputs = [ python3 ];
-  installPhase = ''
-    touch $out
-    python timetable.py ${resultTree} > $out
-  '';
-}
diff --git a/garlic/pp/merge.nix b/garlic/pp/merge.nix
index bd83c46..7f8919d 100644
--- a/garlic/pp/merge.nix
+++ b/garlic/pp/merge.nix
@@ -2,15 +2,22 @@
   stdenv
 }:
 
-experiments:
+datasets:
 
 with stdenv.lib;
 
 stdenv.mkDerivation {
-  name = "merge.json";
+  name = "merged-dataset";
   preferLocalBuild = true;
   phases = [ "installPhase" ];
+  inherit datasets;
   installPhase = ''
-    cat ${concatStringsSep " " experiments} >> $out
+    mkdir -p $out
+    n=1
+    for d in $datasets; do
+      ln -s $d $out/$n
+      let n=n+1
+      cat $d/dataset >> $out/dataset
+    done
   '';
 }
diff --git a/garlic/pp/rplot.nix b/garlic/pp/rplot.nix
index cf194b6..28704d1 100644
--- a/garlic/pp/rplot.nix
+++ b/garlic/pp/rplot.nix
@@ -144,10 +144,10 @@ in stdenv.mkDerivation {
 
     mkdir -p $out
     cd $out
-    dataset="${dataset}"
+    dataset=$(readlink -f ${dataset}/dataset)
 
     ln -s $dataset input
-    Rscript --vanilla ${script} ${dataset} "$out"
+    Rscript --vanilla ${script} "$dataset" "$out"
 
     # HACK: replace the \minus for a \hyphen to keep the file paths intact, so
     # they can be copied to the terminal directly. The StandardEncoding is not