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. Author manuscript; available in PMC: 2019 May 6.
Published in final edited form as: Astrophys J Lett. 2014 May 14;788(2):L24. doi: 10.1088/2041-8205/788/2/L24

Figure 1.

Figure 1.

Measurements of nitrogen isotope ratios throughout the solar system. Triangles are primordial values representing 14N/15N in the PSN. Circles are isotope ratios that have evolved over the 4.6 Billion year history of the solar system. The primordial value for Titan is inferred from models of atmospheric evolution. The composition of each primordial 14N/15N is provided as either the constituent that was measured (black) or inferred (red) based on current understanding of the evolution of the solar system.