X_ex              247 src/brusselator_algo.cpp   unique_ptr<vIdata> X_ex {vIdata::new_sls(fix_grid)};
X_ex              252 src/brusselator_algo.cpp   X_ex->interpolate(fef.surface.fun);
X_ex              277 src/brusselator_algo.cpp     X_ex->interpolate(fef.surface.exact);