diff --git a/script/plot_datafile.gp b/script/plot_datafile.gp
index 87c7391..6a6d4e7 100755
--- a/script/plot_datafile.gp
+++ b/script/plot_datafile.gp
@@ -1,8 +1,5 @@
 # Variables
 FILEDATA = ARG1
-PREFIX = 'plot'
-EXTENSION = '.png'
-OUTPUT = PREFIX.FILEDATA.EXTENSION
 
 # Parameters
 set terminal png size 500,500