Magnetic field model sketches. (a) Perturbed PFSS field generated from GONG magnetogram from 2014 January 10. This is the starting point of the model field. (b) Ideal model field from which optimization constraints were drawn. (c) Result of optimization based on ideal constraints drawn from the POS. (d)–(f) Optimized model fields for cases where initial constraints are scattered away from the POS along the LOS according to a normal distribution with standard deviations of ﹩{\sigma }_{r}=2\buildrel{\circ}\over{.} 0﹩, ﹩7\buildrel{\circ}\over{.} 0﹩, and ﹩15\buildrel{\circ}\over{.} 0﹩, respectively. Models (c)–(f) all represent substantial improvement over the perturbed field in (a).