S2MSIA and S2MSIAp difference

When downloading Sentinel 2 L2A products from SciHub you are given two options: S2MSIA or S2MSIAp. What is the difference between these two products? I have not been able to find a description about S2MSIAp.
Thanks in advance,

Dear Javier,

It is a matter of nomenclature, please be informed that S2MSIAp are the products acquired till 25/03/2018 (called prototype), the S2MSIA are the ones acquired after that date, this change is transparent for the SNAP users from v6.0.1.

Best Regards,

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