Nothing big but I want to share this handy cheatsheet with ya' all

What lipo brands were used for these results?

Towards the 0% capacity you still at over 3v?

These just looks like some generic results. No specific brands have been used. Those charts are just a copy / paste from the following AMPOW article that was created / collated back in 2018 off the back of some data that came from various threads and posts on RC Groups which date back as far as 2005.

• Lipo Voltage Chart: Show the Relationship of Voltage and Capacity https://blog.ampow.com/lipo-voltage-chart
  

And here are some related RC Groups threads that the data in the AMPOW article likely came from...

• Li-poly capacity vs CV charge voltage: https://www.rcgroups.com/forums/showthread.php?333778
  
• Lipo voltage table: https://www.rcgroups.com/forums/showthread.php?350340
  
• Lipo Battery Testing Comparisons as of Oct. 2021: https://www.rcgroups.com/forums/showthread.php?1767093
  
• Lipoly Voltage vs. State-Of-Charge (Remaining Capacity): https://www.rcgroups.com/forums/showthread.php?2245385
  

It is generally known that a LiPo battery should not be discharged below 3.5 Volts per cell.
Betaflight has an OSD item, "Battery average cell voltage" which displays the per cell volts
regardless of the number of cells in the pack. This is likely the single best method to keep
track of the battery discharge and current voltage. When it gets down to 3.5v, then one
should probably land the craft. The low voltage warning is also set by this value.

Additionally, many FC/ESC boards have what is know as a "Low Voltage Cutoff" mechanism
that actually cuts the power when the average per cell voltage drops much below 3.5 volts.

Both of these work on an average "per cell" value. Consequently, the pilot does not need to
calculate nor remember what size pack is being used. Just keep an eye on the per cell voltage.

The Betaflight OSD also has "Battery Usage" indicator. 

Personally, I just use the "Battery Average Cell Voltage" to monitor the battery voltage.
For me, it is the easiest method to determine when I should land.

Is there any resources on the correlation between discharge rate and effective cycles before battery death? For other Lithium Chemistries, it is possible to get an idea of how many cycles you can get based on depth of discharge, for example, most LiFePO4 batteries can be discharged down to 20% and still get 2000 cycles before you start to lose capacity. Is the rate similar with LiPo?