message: Core: minor bugfix for OMP backend (wrong variable name).
diff: @@ -379,7 +379,7 @@ namespace Engine
  // instead, we need to also add the inverse pair to each spin, which makes it similar to the
  // neighbours implementation (in terms of the number of pairs)
  #ifdef _OPENMP
  - int jspin2 = idx_from_pair(ispin, boundary_conditions, geometry->n_cells, geometry->n_spins_basic_domain, geometry->atom_types, exchange_pairs[ipair], true);
  + int jspin2 = idx_from_pair(ispin, boundary_conditions, geometry->n_cells, geometry->n_spins_basic_domain, geometry->atom_types, exchange_pairs[i_pair], true);
  if (jspin2 >= 0)
  {
  gradient[ispin] -= exchange_magnitudes[i_pair] * spins[jspin2];
  