Simple function to add multiple projections bars with extensions to existing plot.
1 2  | 
x | 
 horizontal intersects for bars  | 
y | 
 matrix with array of bars (percentiles; bars)  | 
y2 | 
 matrix with extensions to bars  | 
col,col2 | 
 colours for bar shading and vertical line (median)  | 
lwd,lwd2 | 
 bar width and extensions width  | 
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