Does it mean that Saudi and UK peaked at the beginning of the 80s ?
Saudi Arabia and the UK passed the dashed line at the beginning of the 80s. With the data points up
until then, this model predicted that they had already peaked. But that was a false
"impression" because both started to increase production and then the estimated URR started to
climb.

To say it in another way, this model was "tricked" and thought both countries had peaked,
but they hadn't.