rcpicker *results(char *prefix, int seq)
{
   TString resultsfile;
   TString rootfile;
   TString logfile;
   TString sprefix(prefix);

   if (sprefix == "Si331") {
      resultsfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/Si331_%3.3d_results.root",seq);
      rootfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/Si331_%3.3d_rocking_curves.root",seq);
      logfile = "chess-4-2011/Si331/Si331";
   }
   else if (sprefix == "e6") {
      resultsfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/e6_%3.3d_results.root",seq);
      rootfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/e6_%3.3d_rocking_curves.root",seq);
      logfile="chess-4-2011/e6/e6";
   }
   else if (sprefix == "plate") {
      resultsfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/plate_%3.3d_results.root",seq);
      rootfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/plate_%3.3d_rocking_curves.root",seq);
      logfile="chess-4-2011/plate/plate";
   }
   else if (sprefix == "pristine") {
      resultsfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/pristine_%3.3d_results.root",seq);
      rootfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/pristine_%3.3d_rocking_curves.root",seq);
      logfile="chess-4-2011/pristine/pristine";
   }
   else if (sprefix == "sinmat") {
      resultsfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/sinmat_%3.3d_results.root",seq);
      rootfile.Form("root://nod15.phys.uconn.edu//pnfs/phys.uconn.edu/data/Gluex/beamline/diamonds/chess-4-2011/results/sinmat_%3.3d_rocking_curves.root",seq);
      logfile="chess-4-2011/sinmat/sinmat";
   }
   else {
      std::cerr << "rcp_setup error - dataset \"" << sprefix
                << " is not known." << std::endl;
      return 0;
   }

   TFile *resfile = TFile::Open(resultsfile);
   rcpicker *rcp = new rcpicker(prefix,seq,rootfile.Data(),logfile.Data());
   resfile->cd();
   return rcp;
}