Withholding tax Minimum base amount Vs Exemption Threshold in TAN Exemption for India/CIN

Dear Experts,

Can you please share some knowledge on below 3 fields, in case of TAN based withholding tax Exemption (India) is activated for Vendor ...

1. Minimum Base amount in Withholding tax code : I understand this, in standard if the base amount corssing to the amount entered system will calculate WHT for entire amount

• Vendor master data : CIN details -> TAN Exemption Tab :

2.Exem Rate?

3.Exem Threshold?

I have read list of blogs in SCN and also OSS notes on TAN based exemption process, but still missing how does above fields work