. 2015 Jul 14;407(23):7013–7023. doi: 10.1007/s00216-015-8864-2
© The Author(s) 2015
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Fig. 3.
Calibration curve for CPI