Union pipes.

https://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~36285~101963/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~54542~104802/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~26847~101964/full/,150/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~74225~180644/full/,150/0/default.jpg