OCEAN-An EXCEL add-in for O correction using a novel approximation.

In this publication, an alternative mathematical approach for correction is presented. It is shown comprehensively how the newly developed formulas are derived and what the differences are to the established algorithm recommended by Brand et al. Additionally, two simulations are presented, which demonstrate the performance (in terms of accuracy and precision) of the approach. Part of this work is an EXCEL Add-In, which allows users to perform correction, normalization and uncertainty propagation on their own. This enables the users - who are limited to measure only the masses 44 to 46 - to fully control their data evaluation.•Improved accuracy over a wider range.•Easy use and implementation of the scheme.•Convenient uncertainty calculation in accordance with international standards.