$book = ReadData ($inbook);
my @x = qw(F G H I J K);
for my $sheet_index (1 .. $sheet_count) {
    my $sheet = $book->[$sheet_index] or next;
    foreach (@x) {
       $name = $sheet{"$_28"};
       $strain = $sheet{"$_29"};
       $initdensity = $sheet{"$_30"};
       $finaldensity = $sheet{"$_31"};
       $avedensity = $sheet{"$_32"};
       print "Found sheet with label: $sheet{label}\n";
       print "COL=$_ $name $strain $initdensity $finaldensity $avedensity\n";
    }
}