Not so. I looked at the third plot as Z. And therefore didn't...

Not so. I looked at the third plot as Z. And therefore didn't try and break down the others. If you start with the top plot as Z, then it is completely different, obviously. The label is misleading in the announcement. Have a look yourself at the OP - I cut and paste and then discussed the wrong plot. In isolation, the interp is correct, there is no anomaly in that plot, but it is not the Z component either.