Processing A2_fit/A2_fit_0.cxx...
In file included from input_line_48:1:
/home/whit/work/SANE/A2_fit/A2_fit_0.cxx:126:42: error: use of undeclared identifier 'Model_vs_Q2'
  TF1 * Model_Q2 = new TF1("Model_vs_Q2",Model_vs_Q2, 0.001, 0.9, 1);
                                         ^