I know they're not Appendix G values, and I can't seem to find a mention of where they're sourced from. An internal NREL project?

Any help would be appreciated!

Edit: For reference, here is a Google Sheets plot of fraction of full load fan power versus fan part load ratio for 90.1-2004 Appendix G and the VAV fans in the Commercial Reference Building Large Office ("new", meeting 90.1-2004)