Fig. 3: Carbon (δ¹³C) and nitrogen (δ¹⁵N) stable isotope ratios in the 55 samples of whale bone.

The open circle indicates the position of the one sample where ZooMS failed to distinguish between right/bowhead/fin whale. See Supplementary Data 4, tab “PaleoCet material”, for source data, and Supplementary Data 1 for more details on samples.