diff --git a/tools/rgenetics/rgEigPCA.xml b/tools/rgenetics/rgEigPCA.xml
index eb0885111f6..a595a81390e 100644
--- a/tools/rgenetics/rgEigPCA.xml
+++ b/tools/rgenetics/rgEigPCA.xml
@@ -48,7 +48,7 @@
     <param name="t" value="2" />
     <param name="s" value="2" />
     <output name='out_file1' file='rgtestouts/rgEigPCA/rgEigPCAtest1.html' ftype='html' compare='diff' lines_diff='195'>
-    <extra_files type="file" name='rgEigPCAtest1_PCAPlot.pdf' value="rgtestouts/rgEigPCA/rgEigPCAtest1_PCAPlot.pdf" compare="sim_size" delta="30000"/>
+    <extra_files type="file" name='rgEigPCAtest1_PCAPlot.pdf' value="rgtestouts/rgEigPCA/rgEigPCAtest1_PCAPlot.pdf" compare="sim_size" delta="3000"/>
     </output>
     <output name='pca' file='rgtestouts/rgEigPCA/rgEigPCAtest1.txt' compare='diff'/>
  </test>
diff --git a/tools/rgenetics/rgtest.sh b/tools/rgenetics/rgtest.sh
index 2235e3d85ee..c9df93058f7 100755
--- a/tools/rgenetics/rgtest.sh
+++ b/tools/rgenetics/rgtest.sh
@@ -1,14 +1,33 @@
 #!/bin/sh
 # script to generate all functional test outputs for each rgenetics tool
 # could be run at installation to ensure all dependencies are in place?
-GALAXYROOT=`pwd`
-echo "using $GALAXYROOT"
+if test $# -lt 2
+then
+   echo "We need to agree on 2 parameters - GalaxyRoot and OutRoot - use paths to galaxy and galaxy to re-create all test outputs"
+   echo "or more prudently, galaxy and /tmp/foo for checking without updating all your test-data"
+   echo "Exiting with no changes"
+   exit 1
+fi
+if [ $1 ]
+then
+  GALAXYROOT=$1
+else
+  GALAXYROOT=`pwd`
+fi
+if [ $2 ]
+then
+  OUTROOT=$2
+else
+  OUTROOT=`pwd`
+  OUTROOT="$OUTROOT/test-data"
+fi
+echo "using $GALAXYROOT as galaxyroot and $OUTROOT as outroot"
 # change this as needed for your local install
 INPATH="${GALAXYROOT}/test-data"
 BINPATH="${GALAXYROOT}/tool-data/rg/bin"
 TOOLPATH="${GALAXYROOT}/tools/rgenetics"
-OROOT="${GALAXYROOT}/test-data/rgtestouts"
-NORMALOROOT="${GALAXYROOT}/test-data"
+OROOT="${OUTROOT}/test-data/rgtestouts"
+NORMALOROOT="${OUTROOT}/test-data"
 mkdir -p $OROOT
 rm -rf $OROOT/*
 # needed for testing - but tool versions should be bumped if this is rerun?