BI versus BAR for (25916) 2001 CP44 (square), (85804) 1998 WQ5 (triangle), (164222) 2004 RN9 (circle), and 2004 TD10 (diamond). The rectangular zone includes pyroxene-dominated basaltic achondrite (BA) assemblages. The S(IV) subgroup represents mafic silicate components of ordinary chondrites (OC), from Gaffey et al. (1993). The dashed curve is the limit of the mixing line for olivine and orthopyroxene mixing, as shown in Cloutis & Gaffey (1986). Horizontal lines separate H, L, and LL chondrites. Adapted from Gaffey et al. (1993).