--- a/xy_plot.xml	Thu Oct 29 10:51:23 2015 -0400
+++ b/xy_plot.xml	Thu Oct 29 11:17:43 2015 -0400
@@ -1,9 +1,8 @@
 <tool id="XY_Plot_1" name="Plotting tool" version="1.0.1">
   <description>for multiple series and graph types</description>
   <requirements>
-    <requirement type="package" version="2.11.0">R</requirement>
-    <requirement type="package" version="1.14.2">cairo</requirement>
-  </requirements>
+    <requirement type="package" version="3.2.1">R</requirement>
+   </requirements>
   <command interpreter="bash">r_wrapper.sh $script_file</command>
 
   <inputs>
@@ -79,7 +78,7 @@
         yrange = range( y${i}, yrange )
       #end for
       ## Open output PDF file
-      png( "${out_file1}" )
+      pngcairo( "${out_file1}" )
       ## Dummy plot for axis / labels
       plot( NULL, type="n", xlim=xrange, ylim=yrange, main="${main}", xlab="${xlab}", ylab="${ylab}" )
       ## Plot each series