ConvertDownsamplePos

How to conver Xmipp 3.0 pos to Xmipp 2.4

for i in *.pos
do
   fn=`echo $i | sed 's/.pos//'`
   echo "# X Y " > $fn"_Down24.pos"
   cat $fn".pos" | sed '1,12d' | awk '{printf ("%d %d\n",$1/2,$2/2);}' >> $fn"_Down24.pos"
done