This results are same as the case of muon, 80 strings, slope-1.
Note that the droop is correctly turned off, and we still have the blob.
We still have the strange concentration...
Energy = 4x10^7 GeV, (Ze, Az)=(75 deg., 110 deg.), (x,y,z)=(-700,450,300m)
This is just a blob, so we can easily kill this artifact by a simple cut, though I will check the cause.
Npe Vs Energy