aileen-fisher

From ObsPy Changelog (https://docs.obspy.org/changelog.html): obspy.clients.arclink: submodule removed completely, since ArcLink was officially deprecated and deactivated on all big datacenters years ago (see #2994)

Actually, perhaps a little added documentation would be helpful. SYNGINE_CACHE doesn't seem straightforward to find from just a Google search, or perhaps I'm not looking in the right places. Would...