The Sentinel-3 Cal/Val results as of processing of September 2020 and published in Mertikas et al., (2020) [https://doi.org/10.3390/rs12162642] are:

Transponder (range) Cal/Val:

Sea-surface Cal/Val:

Note that major reprocessing is currently on-going.

The latest transponder responses as captured by the European satellite altimeters overflying the CDN1 Cal/Val site are:

Transponder responses for the CryoSat-2 mission (special Cal/Val testing), 12-Feb-2020 calibration at the CDN1 Cal/Val site (credits: ESA)

Transponder responses for the Sentinel-3A mission, 15-Sept-2020 calibration at the CDN1 Cal/Val site

Transponder responses for the Sentinel-3B mission, 21-Sept-2020 calibration at the CDN1 Cal/Val site.