In this erratum we correct errors in the scaling and caption of Fig. 4 in the original manuscript .
© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
An error in the scaling of the phases plotted in Fig. 4 of the manuscript  was found after publication. The revised figure is shown below as Fig. 1 of this erratum. Furthermore, the line colors and the description in the figure caption are changed in order to coincide with the respective line colors in Fig. 3 of , as initially intended. These corrections have no effect on the results and the conclusion of the paper.
European Association of National Metrology Institutes (15SIB03 OC18, 18SIB05 ROCIT).
We thank Michele Giunta for pointing out the error. Part of this work has received funding in the 15SIB03 OC18 and 18SIB05 ROCIT projects from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.
The use of trade names in this article is necessary for completeness and does not constitute an endorsement by Physikalisch-Technische Bundesanstalt.
RW: TOPTICA Photonics (E), TP, FR: TOPTICA Photonics (E, I)
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