Rather than picking a benchmark pair of treasuries to express a yield curve, this indicator weighs all (excluding the new 20 Year) durations, each against the next, and weights that against the FEDFUNDS rate.
リリースノート
Now correctly weights against the FEDFUNDS rate.
Replaced histogram with a line indicator over a zero line.
リリースノート
Updated with cleaner chart.
NOTE: the FRED:FEDFUNDS rate is only updated monthly, so while this indicator is useful for looking back, it will lag real time rate changes by a couple of weeks. For faster data, use the IORB weighted version of this indicator instead. I will link it in the comments below.