Copy/paste the code below.
#---------------------------------------begin code
declare weak_volume_dependency;
input length = 20;
input factor = 15;
plot scalper_line= Average(close, factor) - log(Double.Pi * (AvgTrueRange(high, close, low, factor)));
plot hi = Highest(high, length);
plot lo = Lowest(low, length);
#---------------------------------------begin code
