Host heimdall
    HostName heimdall044.jet.uk

Host heimdall???
    HostName %h.jet.uk

Host jdc
    HostName 10.40.4.103

Host freia
    HostName freia022.hpc.l

Host freia???
    HostName %h.hpc.l

Host heimdall* jdc* freia*
    User elitherl
    ForwardX11 yes
    ForwardX11Timeout 0
    Compression yes