One of the dataset files is tarred but not gzipped

The archive https://storage.cloud.google.com/ravens-matrices/attrs.line.type.tar.gz
has the .gz extension but it has not been gzipped, only tarred.

I can extract it with `tar -xv`, but `tar -xvz` gives me _gzip: stdin: not in gzip format_.

The other datasets are as expected.