I find the s/r lines with long term weekly charts. The 440 line is the greatest volume s/r. The 400 is the lowest volume, akin to a "gap". When I drew my neck line through what looked like a big head and shoulders forming I figured the price would head to the low volume volume by price point or semi-gap, so I made that my predicted price point. I've added a 380 line because it is the greatest volume support below 400. That may be where the SPY bounces. The year 4 months is purely random. It was a size that conveniently showed everything I wanted on the chart. cheers!
“Hey, don’t worry; don’t be afraid, ever. Because this is just a ride…. And we can change it any time we want. It’s only a choice. No effort, no work, no job, no savings of money. Just a simple choice, right now, between FEAR and LOVE.” - Bill Hicks