Plenty of quality data in most regions of that chart. And so I can compare seasons, and have, and it does show improvements and regressions.
However I was interested in the context of this thread, to see if there was anything interesting to see regarding estimating LT1.
That’s all.
The graph and all my references are % LTHR. I live in the Central Valley of California. Theoretically I could ride several days with no real downhills. There is a time and place for steady efforts, my longer >4 hours rides are “relatively steady” because there are stops for water/toilet and short-ish downhills after long climbs. And responding to terrain.
Anyways, I’m bored with reading and editing a legal contract at work Here you go, a recent long effort at and around 88% LTHR:
and
Took an 8 minute break around 3.5 hours. Starting riding with a slow guy around 5.5 hours. Waited for him at the top of the last climb by riding back and forth. Waited for slow guy at a gas station around 7.5 hours. I could have kept going at around 88% LTHR the entire ride.
Go ahead and tell me about my unhealthy obsession with steady efforts or whatever else I’m doing wrong or misrepresenting or misinterpreting 
I could really use a break from this legal contract, its making my eyes bug out 