Quite a few labs have been asking for a Rb-Sr DRS for triple-quad work. I have adapted a version of the iolite v3 DRS written by Sarah Gilbert at The University of Adelaide for iolite v4. Sarah's work is described in detail in Redaa et al. J. Anal. At. Spectrom., 2021, 36, 322.
You can download the iolite v4 version of this DRS from here. It is a beta version, so please let us know if you find any issues etc.
Many thanks to Sarah for sharing her work with the community!