Sergey started with a setting with quadrupoles already changed like in 2021.
Ths was used for the first isochronicity curves.
It also gave soem, however, not good peak shapes with scrapers closed.
But after a failure only a new setting of quads could revover the peaks.

Then more cooler curves were measured and found to have quite a slope.
Changing ESR energy does not change the curves much, but changing the quads does.
With the stronger variation of quads (+1.65% on two quadrupole families) the curve tilts to opposite side.

All curves in EXCEL.
Cooler voltage converted to Brho with gamma ~ 1.4 and curves in relative frequency spread shifted on top of each other.
In new injections the quads are set new, which causes a frequency jump. Pasted parts of curves to remove jump.