As it has been shown, RSI can be calculated using different types of averages (the basic version was posted here : Rsi (var))
This version is using Jurik smoothing MA in order to produce a very smooth RSI as a result

Ang_Zad_C_Hist
A histogram based on the difference between the main and the signal lines of indicator Ang_Zad_C in the points of the price chart.
Ang_Zad_C
A trend-following indicator of the main and signal lines, drawn as a color cloud.