#!/bin/sh


set -x

for i in f*.ppm; do
ppmtopgm $i > $i.pgm
done


rm -f s*.pgm

for i in 0 1 2 3 ; do

glue f$i.*.pgm > s$i.pgm

done


 
glue s*.pgm > freq.pgm

rm -f s*.pgm

