Additional file 1: Figure S1. of Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios

GC/C/IRMS chromatogram of the 12Â M HCl-hydrolyzed hot-water extracts of the Piv/iPr amino acid esters in Y-980115. The subgraph (a) shows the magnified region with the alanine and glycine peaks. The single-ion traces GC/MS chromatograms of (b) Y-980115 and (c) amino acid standard mixture of the same region as shown in (a) indicate that no coeluting compounds were present that could have interfered the IRMS analysis of Y-980115 and that only alanine and glycine are the main nitrogen-bearing compounds in the region