I want to make a 5-35 osc with bands   same as Advanced get

the 5-35   is no problem , histogram & line
I tried Std Error bands -- couldn't get them to plot properly
moved to StDev ( Bollinger Bands )  also won't plot
message is  basically it's plotting out of range
can't figure that out as i'm trying only  2stdev
here my code so far

a:=Mov(C,5,E);
b:=Mov(C,35,E);
bb:=a-b;
bb; { shown as histogram}
bb;  { shown as a line }

BBB:=BBandBot(bb,20,S,2);
BBT:=BBandTop(bb,20,S,-2);
BBB;
BBT;

can anyone see what my coding  problem is please  or offer any 
suggestions--

thanks Keith

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