Really? If you want, here are mine:
Measured RGGB data + test overview
$ exiftool -'Measured*RGGB*' ./*.CR3 | awk -F ': *' '{ print $2 }' | column -t
# “Normal” picture, not taken just for tests:
1850 1024 1024 185
641 1024 1024 586
744 1024 1024 1087
499 1024 1024 612
629 1024 1024 514
333 1024 1024 871
620 1024 1024 612
559 1024 1024 556
710 1024 1024 351
609 1024 1024 362
556 1024 1024 486
605 1024 1024 564
# Test series:
623 1024 1024 590 # CR3, AWB
618 1024 1024 592 # CR3, Fluorescent white
622 1024 1024 592 # CR3, Custom (assuming I did the calibration correctly…)
620 1024 1024 592 # CR3, Forced 4000K
648 1024 1024 580 # RAW, AWB
626 1024 1024 589 # RAW, Fluorescent white
630 1024 1024 588 # RAW, Custom (assuming I did the calibration correctly…)
637 1024 1024 587 # RAW, Forced 4000K
Here’s an overview of the embedded JPGs of the test series:
Perhaps RT relies only on that and there’s another field somewhere that needs to be used to tweak that? These values are indeed always often lower than 1024. At least with my camera, but also with two raws I got before my purchase to try stuff. One from raw.pixls.us and the other from that other topic on this site.