Thanks! @agriggio - another xicclu graph with the downward hook towards the x-axis. Given that I’m not the only person using this type of monitor profile, I feel better about continuing to use this type of profile.
Is this a custom monitor profile? I would guess yes as obviously you have ArgyllCMS installed. But my impression is that newer monitors are coming out with factory-supplied profiles that are pretty good, so perhaps not making a custom profile doesn’t carry quite the risk of “wrong colors” as it used to, and as @houz and @Morgan_Hardwood noted in the following thread, LCD monitors maintain their state of calibration a lot longer than the old CRT monitors: