Real author:
Alexander Piechotta
The Envelopes indicator with the use of the i-CAi indicator algorithm.
The indicator uses SmoothAlgorithms.mqh library classes (copy it to <terminal_data_folder>\MQL5\Include). The use of the classes was thoroughly described in the article “Averaging Price Series for Intermediate Calculations Without Using Additional Buffers”.
Fig.1. The i-CAiChannel indicator