Distance along the sub-Parker spiral (black curves) is shorter than along the Parker Spiral (blue curves) to Stream Interaction Regions, and a the sub-Parker magnetic field is associated with a lower injection energy compared to a Parker field. We show (top panel) the distance along a magnetic field line to the SIR compression or shock, and (second panel) the radial distance to the SIR compression/shock. These distances are shown as a function of time from stream interfaces at r_o ~ 0.33 au where theobservations are made by IS⊙IS. The sub-Parker spiral also causes a reduced angle (third panel) between the magnetic field and the normal to the SIR compression or shock. Note that the field-to-normal angle at the SIR compression or shock is calculated in the corotating reference frame. The injection energy detailed in Appendix C is also shown (fourth panel).