MA Channel Formula

["Randy Barlow" <rcbarlow@xxxx>]

Would someone look and the following and tell me 
why it will not plot:
 
Topline = ma(h,20);Middleline = ma((h+l)/2, 
20);lowline = ma(l,20);maxgraph = 8;graph4 = 
topline;graph6=middleline;graph8=lowline;graph3 = 
close;graph3style = 64;
 
Thanks,
RandyB
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