void decompress(TString comp_file, TString decomp_file)
{
    TFile* f_comp = TFile::Open(comp_file.Data());
    TFile* f_decomp = TFile::Open(decomp_file.Data(), "RECREATE");
    f_decomp->SetCompressionLevel(ROOT::RCompressionSetting::ELevel::EValues::kUncompressed);
    for (TObject* key_obj : *f_comp->GetListOfKeys())
    {
        auto key = dynamic_cast<TKey*>(key_obj);
        auto ttree_name = key->GetName();
        std::cout << "Decompressing " << ttree_name << std::endl;
        TTree* ttree = ((TTree*)f_comp->Get(ttree_name))->CloneTree();
        f_decomp->cd();
        ttree->Write();
    }
    f_comp->Close();
    f_decomp->Close();
}