simple.h5 and spiral.h5 are not h5 files, they are plain text files containing git information. E.g.,
$ cat simple.h5
version https://git-lfs.github.com/spec/v1
oid sha256:ea1b961eac11430ceefa2b36069be5f0a18f666ae6b5dad5838e959a076023a4
size 84535248
simple.h5 and spiral.h5 are not h5 files, they are plain text files containing git information. E.g.,
$ cat simple.h5
version https://git-lfs.github.com/spec/v1
oid sha256:ea1b961eac11430ceefa2b36069be5f0a18f666ae6b5dad5838e959a076023a4
size 84535248