diff --git a/scripts/gamma-singleray.sh b/scripts/gamma-singleray.sh
new file mode 100755
index 0000000..ed39cb2
--- /dev/null
+++ b/scripts/gamma-singleray.sh
@@ -0,0 +1,110 @@
+#!/bin/bash
+
+# set input/working/output folders
+in=/Users/lorenzo/Desktop/scenario_001
+work=/Users/lorenzo/Desktop/scenario_001/tmp
+out=/Users/lorenzo/Desktop/scenario_001/out
+
+# check if working folder exists, otherwise create it
+if [[ ! -e $work ]]; then
+  mkdir $work
+else
+  if [[ ! -d $work ]]; then
+    echo $work is not a folder.
+    exit 1
+  fi
+fi
+# move to working folder
+cd $work
+if [[ $? != 0 ]]; then
+  echo Cannot move to $work
+  exit 1
+fi
+
+# check if output folder exists, otherwise create it
+if [[ ! -e $out ]]; then
+  mkdir $out
+else
+  if [[ ! -d $out ]]; then
+    echo $out is not a folder.
+    exit 1
+  fi
+fi
+
+listfile=$in/alpha-beta-vs-gamma.txt
+# count number of lines in input file
+nlines=`wc -l $listfile | awk '{print $1}'`
+
+eqfile=$in/F4E_Equil_10520.eqdsk
+# look for time value in equil file
+base=`basename $eqfile .eqdsk`
+tstr=`echo $base | grep "[[:digit:]]\{5\}" -o`
+t=`echo "$tstr-10000" | bc`
+# copy input files in working folder
+cp $eqfile ${base}.eqdsk
+cp $in/${base}.prf ${base}.prf
+
+# set output file names
+id=${base}_8beams_gammascan
+f7file=$out/f7_${id}.txt
+f48file=$out/f48_${id}.txt
+rm -f $out/log_${id}.txt
+# add header in output files
+echo "# =============================" > $f7file
+echo "# `date`" >> $f7file
+echo "# Launching conditions: `basename $listfile`" >> $f7file
+echo "# time=$t" >> $f7file
+echo "# =============================" >> $f7file
+cp $f7file $f48file
+appendheader=0
+
+#loop on lines of launching conditions table
+for (( iline=1; iline<=$nlines+1; iline++ )); do
+  # search full, non-commented lines
+  awkcommand='NR=='$iline' && NF>=6 {print $1, $2, $3, $4, $5, $6}'
+  line=`sed 's/#.*$//' $listfile | awk "$awkcommand"`
+  if (( `echo $line | wc -w`>0 )); then
+    # if valid line extract values
+    ibeam=`echo $line | awk '{print $1}'`
+    gamma=`echo $line | awk '{print $2}'`
+    r0=`echo $line | awk '{print $3/10.0}'`
+    z0=`echo $line | awk '{print $4/10.0}'`
+    alpha=`echo $line | awk '{print $5}'`
+    beta=`echo $line | awk '{print $6}'`
+    # replace dummy values in template for gray.data
+    sed "s/-alfa-/$alpha/g; \
+         s/-beta-/$beta/g; \
+         s/-x0-/$r0/g; \
+         s/-z0-/$z0/g; \
+         s/-equil-/$base/g; \
+         s/-prf-/$base/g" $in/gray0.data > gray.data
+    # run gray
+    gray >> $out/log_${id}.txt
+    if (( $appendheader==0 )); then
+      # append parameters to header if first run of the loop
+      cat headers.txt >> $f7file
+      cat headers.txt >> $f48file
+      echo "#beam dgamma`head -n 1 fort.7 | sed 's/#//'`" >> $f7file
+      echo "#beam dgamma`head -n 1 fort.48 | sed 's/#//'`" >> $f48file
+      appendheader=1
+    fi
+    # add beam number and gamma values in first two columns
+    awk 'NR>1 {print '$ibeam','$gamma',$0}' fort.7 >> $f7file
+    awk 'NR>1 {print '$ibeam','$gamma',$0}' fort.48 >> $f48file
+    echo "" >> $f48file
+  else
+    # if first block of data has already been written
+    if (( $appendheader==1 )); then
+      # write blank line in output when invalid (blank) line is found in input
+      echo "" >> $f7file
+      echo "" >> $f48file
+    fi
+  fi
+done
+#end of launching conditions loop
+
+# remove files from working folder
+rm ${base}.eqdsk ${base}.prf fort.*
+
+exit 0
+#EOF