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    "# hsimpleProxy\n",
    "Used by hsimpleProxyDriver.C.\n",
    "\n",
    "To use this file, generate hsimple.root:\n",
    "``` cpp\n",
    "   root.exe -b -q hsimple.C\n",
    "```\n",
    "and do\n",
    "``` cpp\n",
    "   TFile *file = TFile::Open(\"hsimple.root\");\n",
    "   TTree *ntuple ;  file->GetObject(\"ntuple\",ntuple);\n",
    "   ntuple->Draw(\"hsimpleProxy.C+\");\n",
    "```\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "**Author:** Rene Brun  \n",
    "<i><small>This notebook tutorial was automatically generated with <a href= \"https://github.com/root-project/root/blob/master/documentation/doxygen/converttonotebook.py\">ROOTBOOK-izer</a> from the macro found in the ROOT repository  on Tuesday, May 19, 2026 at 08:16 PM.</small></i>"
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      "input_line_45:2:3: error: use of undeclared identifier 'px'\n",
      " (px)\n",
      "  ^\n",
      "Error in <HandleInterpreterException>: Error evaluating expression (px)\n",
      "Execution of your code was aborted.\n"
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