diff --git a/gnuplot_scripts/Euro_exchange_rate_to_TRY_-_Turkish_Currency_and_Debt_Crisis_2018.plt b/gnuplot_scripts/Euro_exchange_rate_to_TRY_-_Turkish_Currency_and_Debt_Crisis_2018.plt
index 4a0c5ba..70eda4f 100644
--- a/gnuplot_scripts/Euro_exchange_rate_to_TRY_-_Turkish_Currency_and_Debt_Crisis_2018.plt
+++ b/gnuplot_scripts/Euro_exchange_rate_to_TRY_-_Turkish_Currency_and_Debt_Crisis_2018.plt
@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")
 
diff --git a/gnuplot_scripts/Euro_exchange_rate_to_TRY_6000px_wide.plt b/gnuplot_scripts/Euro_exchange_rate_to_TRY_6000px_wide.plt
index 3e30e93..a57af28 100644
--- a/gnuplot_scripts/Euro_exchange_rate_to_TRY_6000px_wide.plt
+++ b/gnuplot_scripts/Euro_exchange_rate_to_TRY_6000px_wide.plt
@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")
 
diff --git a/gnuplot_scripts/Euro_exchange_rate_to_TRY_800px_wide.plt b/gnuplot_scripts/Euro_exchange_rate_to_TRY_800px_wide.plt
index eb633e0..4e922fc 100644
--- a/gnuplot_scripts/Euro_exchange_rate_to_TRY_800px_wide.plt
+++ b/gnuplot_scripts/Euro_exchange_rate_to_TRY_800px_wide.plt
@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")
 
diff --git a/gnuplot_scripts/TRY_exchange_rate_to_EUR_-_Turkish_Currency_and_Debt_Crisis_2018.plt b/gnuplot_scripts/TRY_exchange_rate_to_EUR_-_Turkish_Currency_and_Debt_Crisis_2018.plt
index a5cbaf5..943d3bc 100644
--- a/gnuplot_scripts/TRY_exchange_rate_to_EUR_-_Turkish_Currency_and_Debt_Crisis_2018.plt
+++ b/gnuplot_scripts/TRY_exchange_rate_to_EUR_-_Turkish_Currency_and_Debt_Crisis_2018.plt
@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")