Fits with the expansion-modified force-free cylinder flux rope model applied to representative in situ profiles for (a) Run A and (b) Run B. Simulated data are shown in black, single-rope fits considering a positive helicity sign are shown in magenta, two-rope fits performed for the (θ, ϕ) = (0^∘, −20^∘) profiles are shown green, and single-rope fits assuming a negative helicity sign performed for the (θ, ϕ) = (−20^∘, −20^∘) profiles are shown in blue.