Chosen features and visualization of feature-matching methods with (a) the streamer direction method from II.a (using LASCO C2 for 11 Jul. 2010, R_ss = 2.9 R_⊙ and R_scs = 1.9 R_⊙), (b) the streamer width method from II.a (STEREO A COR1 for 1 Aug. 2008, R_ss = 3.0 R_⊙), and (c) the brute force matching method from II.b (using an high-resolution eclipse image by Druckmüller for 11 Jul. 2010, R_ss = 2.4 R_⊙ and R_scs = 1.4 R_⊙). In (a), (b), and (c), blue markings result from the observation, while red markings result from the modeled field lines. (d) gives an illustration of the two possible definitions of the streamer width by the underlying closed topology of the model (closed field, angle marked by solid lines; first open field, angle marked by dashed lines).