I am getting strange results when trying to output an .exr panorama, and I 
was hoping someone could tell me what I am doing wrong.

Windows 7, 64bit, 16GB RAM
Intel i5 CPU
Nvidia Quadro graphics

Aside from the masked area at the bottom of the composite, the panorama 
always has some sort of mapping or blending problem. I don't know how to  
describe it, so it is best if I show you. Dropbox link is at the bottom.

It was taken with a modified (APS-C intended) 8mm samyang on a full frame 
camera, meaning it is like a circular fisheye, but the top and bottom of 
any image are cut off, and the circular crop marks extend over the edge. 
Actual view angle is about 180°.

When using the advanced or expert interfaces with control points alone I 
couldn't get the sky (which, as you will see, is a single piece right to 
the ground) to project properly. I finally managed to do so by dragging it 
in the simple interface and pressing align, but that cause its own share of 
artefacts - from ghosting to what looked like a diminished dynamic range at 
the highlights (speaking only innear the sun area).

I don't know what else to do, and have not found anything relating to these 
issues in the documentation.

At the link you will find a zip file with the panorama in question, the 
save file, result...
https://www.dropbox.com/s/enq5j06uq9vza1y/hugin_20180730_360.zip?dl=0

Any help appreciated.

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