grep -A2002  "IMAGINARY DIELECTRIC FUNCTION"  OUTCAR > 1
tail -2000  1 > EPS_IM.dat
grep -A2002  "REAL DIELECTRIC FUNCTION"   OUTCAR > 1
tail -2000  1 > EPS_RE.dat
grep "NOMEGA" INCAR > 2
sed 's/\(.\{7\}\)//'  2 > NOMEGA.dat
grep "OMEGAMAX" INCAR > 2
sed 's/\(.\{9\}\)//'  2 > OMEGAMAX.dat
cat NOMEGA.dat OMEGAMAX.dat > OMEGA.dat
rm -f NOMEGA.dat OMEGAMAX.dat