I downloaded the most recent zip file from https://cddis.nasa.gov/archive/doris/products/orbits/ssa/s6b/. The exact file is ssas6b30.b26133.e26143.DG_.sp3.001.Z
There isn't a space between the first and second velocity components for every single velocity listed, which causes the python SP3 library to throw an exception when attempting to read from it. This file should be edited and reuploaded.
Error In SP3 File Writing for Sentinel 3B
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CDDIS - rlimbach
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Re: Error In SP3 File Writing for Sentinel 3B
Based on the format documentation, the records are not space delimited: https://files.igs.org/pub/data/format/sp3c.txt. The data, however, is sent in with F14.7 instead of F14.6 – I can reach out to the provider about the precision but otherwise, they are within the specifications of the documentation.