When exporting an interferogram for unwrapping with snaphu, the generated coherence and phase files have the wrong byte-order in the header file.
The data is litte-endian but the header file claims they are big-endian.
Viewing the exported files in the SNAP UI shows that they are misinterpreted.
Changing the byteorder in the header file to 0 for those files results in them being displayed correctly.
Luckily, it seems that snaphu ignores the byteorder indicator in the hdr files (which is probably a bug in snaphu, too) and processes them as expected.
As the snaphu process works, it’s probably not a big deal but it would be nice if the header files were correct.