N:=5; P:=20; MN:MA(C,N),COLORWHITE; MP:MA(C,P),COLORYELLOW; RN:=REF(MN,1); RP:=REF(MP,1); A1:=N*P*(RP-RN); A2:=P*REF(C,N)-N*REF(C,P); JC:IF(CURRBARSCOUNT<=20,(A1+A2)/(P-N),DRAWNULL),COLORFFFF00,DOTLINE;