level-B to Use Case: MACOBAC

A quick question:

where does these numbers come from? here

B-DPPS-5180 Retrieval of CO2 Data (Keeling Curve): External Data Source

B-DPPS-5190 12-Month Average Atmospheric CO2 Background Concentration

B-DPPS-5200 12MACOBAC: Computation Cadence and Validity

maybe related to : B-DPPS-4000, B-DPPS-4010 ? after our last review