In this particular case, we have 16 of these atoms, one double bond. And so it's 16 to one in this case, it's 16 to two. We have two double bonds, and in this case, it's 16 to three because we have one, two, three of these double bonds. So we see that fatty acids basically vary in the number of carbons, their length, as well as degree of unsaturation. So if we have a high degree of unsaturation, that means we have many double bonds. If we have a low degree of unsaturation, that means we have few double bonds.