As of August 2018, we use LIMS (Laboratory Information Management Systems) for Light Stable Isotopes, version 9.205 and LIMS for Lasers 2015 to manage workflows and correct and normalize all raw isotopic data. The software is developed and provided free of charge by the USGS. For more information, visit https://isotopes.usgs.gov/research/topics/lims.html.

Raw isotopic data are normalized to international scales in LIMS using linear least squares regression. In the linear equation **y = mx + b**, *y* is the final delta value, *m* is the expansion coefficient, *x* is the penultimate delta, and *b* is the additive correction factor.