Absolute Galactic latitude for the five SVC fields plotted vs. the standard deviation of the RMs of the sources in the field. Black diamonds show the values for compact and extended sources in an SVC field, small circles show only compact sources, and large circles show only extended sources. Green diamonds show only the values for the cross-matched NVSS sources and the red diamonds the Milky Way foreground RM from Oppermann et al. (2012).