for (1..27) {
  open TEXT, ">cell_$_.txt" or die "Can't create cell_$_.txt: $!\n";
  printf TEXT "%14.11f  %14.11f  %14.11f  %14.11f  %14.11f  %14.11f\n",$a, $b, $c, $alpha_deg, $beta_deg, $gamma_deg;
  close TEXT;
}