Isotopic compositions of C, N, and Si of AB2 and MS SiC grains from this study are compared with literature data (Gyngard et al. 2006; Hynes & Gyngard 2009) and observational data for J- and N-type carbon stars (Hedrosa et al. 2013). For ¹⁴N/¹⁵N, the protosolar value of 441 ± 5 reported by Marty et al. (2011) is shown as a dashed–dotted line for reference. The dashed lines represent terrestrial isotopic compositions. The literature data for AB2 and MS grains (Hynes & Gyngard 2009) were used for the Si isotope linear fits. For clarity, the uncertainties in the literature presolar grain data and the observational data for N-stars are not shown. The observational data with arrows are lower limits.