SPY_W_BUYS_SELLS_DIFFERENT_SYSTEMS . 01_SPY_W_MACD stockcharts.com/c-sc/sc?s=SPY&p=W&yr=6&mn=0&dy=0&i=p69877893170&a=258754857&r=425 . 02_SPY_W_RRC stockcharts.com/c-sc/sc?s=SPY&p=W&yr=6&mn=0&dy=0&i=p35160400285&a=259077131&r=837 . 03_SPY_W_NORTHAM stockcharts.com/c-sc/sc?s=SPY&p=W&yr=6&mn=0&dy=0&i=p78703923888&a=263961488&r=761 . 04_SPY_W_ELDER stockcharts.com/c-sc/sc?s=SPY&p=W&yr=6&mn=0&dy=0&i=p02616335166&a=264527631&r=575