How many HIVE prices the blockchain has?

I keep struggling with the HIVE price data feeds.

So far this is how I understand it:

• Each witness provides data for the price,
• The blockchain takes the top20, and calculate the current feed price from the 3.5 days average,
• Posts payouts, virtual supply, debt calculations etc happens at this price,
• When conversions are made they are made at the 3.5 days median of the feed price, adding another data point for the price

This means we will have three types of data for the HIVE price:

1. Market prices provided by witnesses
2. Feed price calculated as a 3.5 days average from the market data
3. Median feed price calculated as 3.5 days median price from the feed price

The time units seems to be hours.

Is this it?
Anyone?

:)

https://gitlab.syncad.com/hive/hive/-/blob/master/libraries/protocol/include/hive/protocol/config.hpp#L304