diff --git a/code/shell/heredoc.sh b/code/shell/heredoc.sh
index dd2c438..46afdbd 100755
--- a/code/shell/heredoc.sh
+++ b/code/shell/heredoc.sh
@@ -1,10 +1,10 @@
 #!/bin/bash
 
-TITLE="Here Doc"
+TITLE="Here Doc ($$)"
 
 gnuplot << __EOC__
-set term dumb
-set grid
-set title "$TITLE"
-plot [x=0:pi*2] sin(x) 
+  set term dumb size 72,24
+  # set grid
+  set title "$TITLE"
+  plot [x=0:pi*3] [-1:1] 0.7*sin(x) 
 __EOC__
\ No newline at end of file