//Forex Sessions
study("Forex Sessions", shorttitle="SessionsFX", overlay=true)
t1 = time(period, "0700-1600")
t2 = time(period, "0200-1100")
t3 = time(period, "1800-0300")
t4 = time(period, "1600-0100")
NewYork = na(t1) ? na : green
London = na(t2) ? na : red
Tokyo = na(t3) ? na : blue
Sydney = na(t4) ? na : aqua
//white silver gray maroon red purple fuchsia...
