Purpose of the TPM PCR banks # 12, 13 and 14

Microsoft documentation mentions the following records:

  • PCR 12: data events and highly volatile events
  • PCR 13: Starter Module Details
  • PCR 14: boot authorities

Could someone provide more details on what measurements are supposed to be stored exactly in these 3?

I tried searching the web, read chapter 12 of "A practical guide for TPM 2.0" and briefly review the documentation available on the TCG website, but it was in vain.