If you want to download the tar packed version:

magnet:?xt=urn:btih:852795102149749ad91123af01ceac5da6f9eb5a&dn=hexane-corpus-tar&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Fopen.demonii.com%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Fexodus.desync.com%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A6969%2Fannounce&tr=udp%3A%2F%2Fopen.stealth.si%3A80%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.dler.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.bittor.pw%3A1337%2Fannounce&tr=udp%3A%2F%2Fretracker01-msk-virt.corbina.net%3A80%2Fannounce

And if you want the unpacked version:

magnet:?xt=urn:btih:db503db679f508aa31a9e07913b2aa8cf7aa6dff&dn=hexane-corpus&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Fopen.demonii.com%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Fexodus.desync.com%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A6969%2Fannounce&tr=udp%3A%2F%2Fopen.stealth.si%3A80%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.dler.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.bittor.pw%3A1337%2Fannounce&tr=udp%3A%2F%2Fretracker01-msk-virt.corbina.net%3A80%2Fannounce

The tar packed file downloads quicker and doesn't require as much memory in your torrent client. But you will have to unpack it to get to the actual files... Neither of them are compressed, so the size is the same. The choice is yours. I'm seeding both.