| Red: Unreliable | Qualitative 15NH3 analysis only, or attempts of a quantitative 15NH3 analysis using inadequate experimental procedures (e.g. H/D exchange in NMR). |
| Yellow: Inconclusive, yet might be reliable | Reliable quantitative demonstration of the 15NH3 production rate and faradaic efficiency under one set of conditions only. |
| Green: Reliable | Quantitative 15N2 reduction data as a function of time provided in satisfactory agreement with corresponding key 14NRR data, based on rigorous and fundamentally sound procedures and methods. |
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