Universal Time Frame - Day Trading Italia

study("Universal Time Frame", shorttitle = "uniTF", overlay=true)
higherRes = input("15", type=resolution)
upperBound = input(high, type=source)
lowerBound = input(low, type=source)

isNewBar(res) =>
    t = time(res)
    change(t) != 0 ? 1 : 0
    
isnb = isNewBar(higherRes)

ub = isnb ? na : security(tickerid, higherRes, upperBound) 
lb = isnb ? na : security(tickerid, higherRes, lowerBound) 

p1 = plot(ub, title="upperBound", color= lime, style=linebr, join=false, transp=70)
p2 = plot(lb, title="lowerBound", color= lime, style=linebr, join=false, transp=70)

fill(p1, p2, color=lime, transp=70)