Functions for downloading,
calibrating, and analyzing atmospheric isotope data bundled
into the eddy covariance data products of the National Ecological
Observatory Network (NEON) < https://www.neonscience.org>.
In this version, calibration tools are provided for only the
carbon isotope products. Tools for calibrating water isotope
products are under development. More details are found in Fiorella et al. (2021)