Strength SPX500 GER30 XAUUSD JPY

study("Strength SPX500 GER30 XAUUSD JPY", precision=3)
fast=input(5)
slow=input(15)
v1=security('SPX500/USDJPY',period,close)
v2=security('SPX500/XAUUSD',period,close)
v3=security('GER30/SPX500',period,close)
v4=security('GER30/USDJPY',period,close)
v5=security('GER30/XAUUSD',period,close)
v6=security('XAUUSD/USDJPY',period,close)
SPX=(v2+(100-v3))/3
GER=(v3+v5)/3
XAU=((100-v2)+(100-v5))/3
JPY=((100-v1)+(100-v4)+v6)/3*100
spx=tsi(SPX,fast,slow)
ger=tsi(GER,fast,slow)
xau=tsi(XAU,fast,slow)
jpy=tsi(JPY,fast,slow)
plot(spx,color=green,title='SPX500')
plot(ger,color=gray,title='GER30')
plot(xau,color=orange,title='XAUUSD', linewidth=2)
plot(jpy,color=#ff3377,title='JPY')
hline(0,title='midpoint')
hline(0.5,title='overbought')
hline(-0.5,title='oversell')