Two colored filled rectangles drawn between the values ​​of two Bollinger channels on one bar.

Indicator input parameters:

//+------------------------------------------------+ 
//|  Indicator input parameters                    |
//+------------------------------------------------+ 
input string Symbols_Sirname="XMA_BB_Pivot_";  // Name for the indicator labels
input Smooth_Method XMA_Method=MODE_SMA_;      // Method of averaging
input uint XLength=100;                        // Depth of averaging                    
input int XPhase=15;                           // First averaging parameter,
3//---- for JJMA within the range of -100 ... +100, it influences the quality of the transition process;
//---- for VIDIA it is a CMO period, for AMA it is a slow average period
input double BandsDeviation1=2.0;              // Deviation 1
input double BandsDeviation2=4.0;              // Deviation 2
input Applied_price_ IPC=PRICE_CLOSE_;         // Price constant
input color Up_Color=clrAquamarine;            // The color of the upper band
input color Dn_Color=clrPlum;                  // The color of the lower band
input uint SignalBar=0;                        // Bar index to get the indicator values
input uint SignalLen=40;                       // The length of the indicator bands

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.

Fig1. The XMA Bollinger Bands Pivot indicator