-------------------------------------------------------------------
      2D Flux Vectors: Computed, Averaged, or Exact
                       [incomplete list]
-------------------------------------------------------------------
Computed at quadrature points (qp):
  el_qp_flux_vectors.m:
  quiver_el_qp_flux.m:
  quiver_qp_flux_mesh.m:

Averaged (ave) with Super_convergent_patch (scp):
  ave_node_flux_1d_graph.m:
  quiver_scp_ave_pt_flux.m:
  scp_ave_pt_flux_vectors.m:

Known exact (ex) flux values (when avilable):
  exact_and_fe_node_flux_vec.m:
  exact_node_flux_vectors.m:
  quiver_exact_node_flux.m: